Josh is a really great host. The communication before the trip was nice and we really felt that he take care of us and wanted us to have an amazing stay in London. When we arrived we had a basket with some snacks, fruits and two guides. There were also some stuff in the refrigerator, toast and a brand new coffee machine to try. I'm glad that we had the possibility to have a chat with him too and he can give you some really cool tips what you can do in this big city.
His apartment is nearby the tube but aside from the transfer from/to the airport we haven't really used it because everything was reachable within 30-45 minutes by walking.