I stayed in Marcus place for 9 days during December, we are a family of five with three little kids. The apartment was warm and very comfortable. Can't complain about anything as it had everything we needed, and the location is one of the best places to be in when visiting London for leisure.
Did not get the chance to meet Marcus, but he was very responsive and quick to answer any of our questions over email.
I would use this place again if I am visiting London alone for business or for fun with the family!