This flat is wonderful in every way. It is very spacious for two people, even more adorable than the pictures, decorated with interesting and quirky art and objects, private, and extremely comfortable. The neighborhood is interesting but quiet. The flat is an easy walk from Regent's Park and from several tube stations and bus stop so you can get anywhere fairly quickly. It's also close to many restaurants, cafes, pubs, groceries, and so on.
We never met Matt, but he was quick to answer any questions by email. His friend Helen graciously opened the flat for us and explained everything.
We stayed here a week and highly recommend it.