Gorgeous Geneva
During my time in Switzerland, Geneva was homebase. Although not the most central Swiss location (being on the western-most side of the country), there are several flight options from the UK and I have friends there, so accommodation was free. Just as well, since Geneva is the fourth most expensive city in the world.
It is also the most international city in Switzerland. Not surprising, since it’s home to the world’s second largest United Nations office. This means that you will hear English and several other languages spoken everywhere you go.