Staying at Adam's place was great. It is a beautifully furnished flat in a really nice area. Adam left just after I arrived, but as far as I can say he is very friendly and helpful. He explained everything (heating, kitchen facilities, wifi,...) and also texted me during our stay to ask if we are fine.
The flat is amazing, we felt so comfortable and liked it a lot. You have easy access to the underground and also taking a taxi is just around 15 pounds from the city centre.
London is a great city anyway but having such a awesome accommodation made our trip even better.