It brings the best of both worlds: a very top research and teaching environment and one of the best (if not the) cities of the world to live in.
Nature, peace, a public sector that works, the happiest country in the world. If you don’t have problems with the cold weather, it is the best place to be.
The researching and teaching is also top notch. For PhDs, English is enough. But if you are looking for BS or Masters, than you need to check.