I definitely recommend the apartment of Sweetstay.
1. Very good location (close to underground and just 6 km from the centre of the city),
2. Sweetstay's staff (Alexandra in particular) is very nice, caring and friendly (she was waiting for us in spite of the fact that we were 3,5 hours late, she advised what to visit and gave other useful recommendations),
3. apartment is very well equipped and cozy (towels, show gel, hair dry, kitchen accessories),
4. apartment locates in wonderful very English area, like from English cinema.