It goes without saying that Hampstead is amazing and Chaco's apartment puts you right in the heart of it all. A stumble across the street to the pub, a short stroll to multiple bakeries and a reasonable 3-4 minutes to the tube.
The flat was still under a bit of unfinished re-furnishing and re-organization when we arrived, which makes it hard to judge for the long term, but the things we saw were great and clearly Chaco is prepping to have a great AirBnb for the long run. That said, if you're traveling in the Autumn of 2017, please check in and see how complete it is. We'd happily stay in the flat again though once it's done!