I have been accepted to the Universities of Vienna, Copenhagen, Utrecht and Maastricht for an LL.M focusing on Public International Law. I spoke to my undergraduate international law professor, who is French, and when I told him I was leaning towards Utrecht he seemed very surprised. He strongly recommended the University of Vienna to me, and said his second choice would be Copenhagen. What is the reputation of these schools and their programs like? Do any of you have experience with them?

I can tell you that according to international standards, I have seen that Utrecht University this year was the 52nd best in the World ( I have seen it as the 80th too, but you know that this statistics can vary slightly).

I believe that to choose your Master, you must take into consideratoon other spects. In the Netherlands there is only a 5% unemployment rate abd you have th eHague, you are close to the UE, International Criminal Court, etc.

By the way, congratulations! I have applied to the Global Criminology MA offered in Utrecht and I´m anxious to get an answer. When were you notified your acceptance?

Forget about the listings. Instead, always focus on what you need for your career and who of the faculty listed may be able to give you solid know how. I alway say to my students in London, look at the teachers and then you know what you will get. In case of the Vienna Law School, your professor is absolutely right. You rarely have such an outstanding faculty in one place!
More important here is what a graduate of teh Viennese LL.M. Program International Legal Studies has answered in his post about his experience under: www.llm-guide.com/board/66312.
I participated in the program LL.M. in International Legal Studies at the University of Vienna during the academic year of 2007-2008. I have noticed that no information is available from a former student, so I decided to describe my experience.
Two words come to my mind concerning my experience of studying in the program: unique and interesting. My view is that the program is unique in the sense that it is not a mass LL.M. program you will not, as a student, sit in class with 200 other master students finishing their Austrian masters degree (...which is the case in some European universities and I would have found unappealing...). Instead you will be part of a small group of students which are able to have interesting dicussions with a number of professors who are renowned in their field. This has its pros and cons; the pros are that you are able to take an active part in class with your colleagues and the professors; the cons are that it is not the cheapest LL.M. program available. Still, it is cheaper than programs in many US and UK universities in terms of tutition and much cheaper after having taken into account living accommodation.
The Program contains four modules. I will not go into the details of these modules as they are described on the Program´s website.
The professors have all taught extensively in Europe and in the United States. Some have worked for the Austrian Foreign Ministry (e.g. Professor Hanspeter Neuhold and Professor Karl Zemanek), at the UN level (e.g. Professor Gerhard Hafner and Professor Manfred Nowak), at specific fields of law concerning investment protection and international institutions (Professor August Reinisch) or in GATT and WTO law (Professor Friedl Weiss). Other professors, such as Christoph Schreuer, are very well known in international investment law, especially regarding the ICSID Convention. Some of the professors are or have been involved in the most prestigious international lawyers institutions, such as the International Law Commission, the International Law Association, etc. ....... So all in all, you will get to study law, have interesting conversations with the law professors in class or in study trips in various European cities, enjoy Vienna and its surroundings and meet a group of students from different countries. The best part is that you will probably have fun while doing so.

Can I ask which university you decided on in the end? My first choice for a PIL LLM next year is Utrecht, but this is in part because I spent a year there as an exchange student during my undergrad degree and I absolutely loved the city (faculty was great too, but a lot more laid back than what I was used to in England). I'm also lead to believe that it can offer great opportunities for internships in the Hague.

Yes - as I have already said before, look at the teaching faculty at Vienna's LL.M, International Legal Studies first, and then also what the students are doing every year. You can read it all in the website: international-legal-studies.univie.ac.at./
By the way: Times Higher Education ranked the University of Vienna as the 32nd best university in continental Europe!! That sounds better than Utrecht and most other universities mentioned in recent comments!
Why not read all the postings first before asking the same questions and messing up the blogs intertwined with so many universities listed in the LL.M Guide? You are just filling up a lot of space!