My wife and I spent two nights at Felipe's flat. His communication was awesome, helping guide us in when we got lost, and he was waiting for us in the street when we got there. The flat was exactly as described, and perfect for what we were looking for. He showed us around, and explained the features. I was unfortunately rather ill during that part of our holiday, so I didn't spend much time with Felipe or his other guest, but my wife did. Felipe took the time to introduce them, which made it more comfortable. When we were going to go sight seeing, he had good recommendations. If we had the time to see London properly, I can't imagine a better guide.
My wife and I are very private people, and while we were made to feel welcome and at home, we never felt like our privacy was invaded, nor did we feel uncomfortable closing our door - the amount of interaction was left totally up to us.
As to leaving, we had a very early bus to catch to Paris, and Felipe was very accommodating in that regard. All in all, if we find ourselves returning to London, Felipe will be the first person I check with. It was an incredibly positive experience, and I highly recommend him, and his flat.