Lovely flat in a fantastic neighborhood -- you could easily spend a whole vacation within a few blocks and not get bored! (Of course, if you want to travel farther afield, the Liverpool Street tube station is only a few minutes' walk and connects to several of the major lines.)
The place itself is very nice and clean with up-to-date amenities and ample storage space. Matthew and his housekeeping staff are very friendly and easy to communicate with. Easy self check-in and check-out. Despite being so close to bustling streets and alleys, the flat is quiet and peaceful at night (you may hear some mild street noise from the living room, but the bedroom is well shielded).
In all, a great choice for a London trip!