We used John's place as a base for going to an event at the O2 Arena and to see friends in London.
There are busses outside the house that take you to the O2 in around 15 mins, and there's a 24/7 service to get you back if it gets late. You can also get to the centre of London in about 20 mins by train from Kidbrooke. And it's great in London that you can use contactless cards for trains, the tube, and busses. Really easy! Blackheath is a 20 minute walk using a shortcut through some pretty lanes. There are lots of cafés and restaurants there.
We spoke to John and Daniel at the start of our visit, but after that we didn't see them. The house is very quiet and feels private. The room was comfortable and clean and we had the use of our own bathroom. All in all a good stay and we would recommend it, especially if you are going to the O2.