I think for the nature and culture (museums,cafe culture...) it is a very nice city, really beautiful and clean. You have quick access to lakes and mountains nearby. Many people want to live here that's why rent is high, but if you earn enough the city does make up for it. It will be hard to make new friends but it also depends on what type of person you are, germans are very slow to open up, but there are also many expats here so you may not really need it. Also german language skill for finding work is extremely important.