Nice cozy apartment, great location. The apartment is on the first floor up a flight of stairs. This represents no problem everyday but it's something to consider when you arrive with suitcases. The apartment is perfect for 2, would accommodate 3 but 4 would be tight. The bed is very comfortable and the abundant hot water welcome when you come back from a day of sightseeing in the cold. The kitchen has what you need and wifi works fine.
There is a subway station 400 mts away, two others 700/800 mts away and plenty of buses. Very easy to move around and get to popular sites. There is a supermarket and commercial street 2/3 blocks away. All in all, a nice pied a terre for your London vacation.
You self check in and out which was very easy. We had only one question to which Mark responded almost immediately.