Marianna's House is fantastic !!!
There is a big house confortable enough for 8 or 9 people. A very good restoration work has been done in all the house. Practically everything is new, very new (as the photo shows).
Obviously, the house isn't in the center of London, but there is a train very near of the house, so you can reach the center of the City in 20-25min (Victoria Station).
Our stay was very confortable. Fully recommended !!