We had a lovely stay at Mark's house - the place was great and he was a very accommodating host.
As local residents ourselves (we stayed at Mark's house whilst we were doing house renovations) we can vouch for his description regarding location and proximity to transport links and attractions. Mark also had a visitors guide prepared at the house which contained a lot of useful information not just about the house, but also about attractions and local eateries which would be very useful for anyone not familiar with the area.
As a host, Mark was great. He was very responsive to all of our enquiries, including the time when we accidently locked ourselves out of the house - he was able to arrange for us to locate a spare pair of keys and we were back in the house within 15 minutes.
We would highly recommend Mark's house to anyone staying in London.