We really enjoyed staying here even for one night, it was a lovely and clean flat, a bit far from the centre but we already knew that; only a 5 minute walk from the underground station though. We never got to meet Carl, but he was very quick to reply and very helpful, and so was Elaine, she was lovely.
The steps to the flat are indeed quite steep and the sloped ceiling is a bit hazardous if you're really tall, but we were aware of this and it wasn't a problem, maybe just the ceiling for my boyfriend :D
All in all, it's a nice, clean and quiet place (the tea and jam made it even better) and Carl and Elaine are lovely. We would definitely recommend staying here and we will come back one day!