Visited London on an evening-to-morning layover (and fell in love with the city), stayed at Andy's place. It was fairly convenient to get there from Heathrow, took just over an hour including a 10 minute walk from the nearest underground station. I texted Andy a couple of times asking for directions, to which he replied immediately. The house and neighbourhood were both great. Andy's place was nice and cozy and very clean. A nice mattress (no bed, but I don't mind), a couch, a couple of drawers with a few city guides on them, and a small-ish TV are there the room. Bathroom was shared, but spotless. Kitchen was available for use too, with various teas, coffee and other stuff made available (not a lot of stuff to eat though). The kitchen could do with a bit more of cleaning though.
Andy was very warm in welcoming me, and was extremely friendly helpful in suggesting places I could go visit. Staying at his place was a pretty good experience, and I'd definitely be happy to stay there again.