We had a really nice time in Belsize Park. The flat had everything we needed and the host thoughtfully had milk in the fridge and fruit on the table for us when we arrived. The flat lacks nothing, it has everything a family of four might need. The location was perfect, too. We could walk through Primrose Hill on to Regent's Park, then Oxford Street. Or we could head north to Hampstead. There are tube stops nearby and many shops, restaurants and whatever else you could want. The neighborhood seems very safe and residential, even late at night. The other occupants in the surrounding flats were nice and quiet. My only issue was that I worried that my family was too loud because my five year-old likes to jump around and the flat is above another. We were very conscious of this. Overall, I would definitely stay there again. Everything was provided for us and we were very comfortable.