Hard to say, when you like IM with it`s freedom to work nearly everywhere at our nice planet. When you like surfing look for cool beaches, like you can find in portugal. For cheap living and founding a tech related company I prefered the philipines.
In my past I was living during the summertime in germany, mostly in berlin, which is realy populare in last days. So you will find many zalandoos, macies, socialmedia nerds and other kind of hipsters. for the wintertime I was at the canarian islands, which is very relaxed.
BTW, London to berlin is a short trip.
F***, I miss this time of living:beach2: