We spent 3 nights at Matthew's place and really enjoyed it! It is very well located (2 minutes from the underground) and the house is beautiful: well decorated (we fell in love with the floor) and very welcoming. We liked the good balance between the privacy of the room and its facilities and the opportunity to discuss with Matthew about London, and places to visit.
The fact it is on the Northern Line (underground) makes it very central to explore London and really easy to reach from the Eurostar station. We LOVED it!