Had a great stay at Duncan's place recently. It was as described, extremely clean and tidy and the check in details were very thorough and accurate.
Access to central london is easy by bus and walking to portobello road is extremely quick!
Lots of nice cafes and shops nearby. The only disadvantage we noticed was that there were no curtains in the bedroom meaning it is very light in the morning. We didn't mind this as we were getting up early but if you like sleeping in a really dark room/lie in then take an eye mask with you.