It's difficult to describe Rowan's place, but let me attempt.
1) Great host, his thoughtful notes all over the place were really helpful in getting around the house, and the local area.
2) Awesome location - walking distance from Marylebone and Paddington stations, and Baker Street. We saved a lot of money on cab fare.
3) Adjusting - allowing us to keep our luggage at the apartment even before check in timr, so that we could go around the city without worries.
4) Extremely thoughtful - especially the multiple charging points for our mobile phones. Being from outside UK, we had only one compatible adapter for 4 mobile phones. Rowan provided us a number of USB ports, that helped us charge all our phones overnight.
5) Well stocked bathroom, clean towels, comfortable room.
I would definitely want to stay here during future visits to London.