I lived in London for 19 years before I went to uni and I miss it now, can't wait to come back. Yes rent prices are expensive, and there is a lot of crime in some areas, but then thats the same everywhere really. The transport system is second to none compared to other places in the UK- buses every 5-10 minutes at all hours of the day and night, plus the tube as well. Yes there are sometimes delays but thats inevitable really given the age of the system. There is always something to see and do as well, including several free museums and galleries.