About the host: we didn't meet Max in person, but communication with him was always very simple and straightforward. He is friendly and easy-going.
About the flat: the flat is located in a quite modern building in Hackney, which is a great neighbourhood full of small shops, cafes and restaurants. (esp. check the Saturday market). Flat is very cosy, specious and stylish.
There is a self-checkin safe box with a flat's key, what is great since you can check-in any time you want.
I would definitely stay at Max's place again when I am in London.