I stayed here twice on my recent trip to the uk. Firstly for 3 nights in a twin room with my sister and secondly in a single room for 1 night. Overall I thought it was a great place to stay when in London - clean uncluttered rooms, comfortable beds, decent showers and a good location. Earls Court tube is just a 5 minute walk away and can get you around London and to Heathrow airport easily or you can walk to the Kensington museums in 15 minutes. Although the hotel doesn't have a restaurant there are lots of places nearby to eat, get a drink or buy food/readymeals to have in your room.
Yes the rooms are fairly small and don't have great views (a wall from the first room and the pavement from the second!) but you don't go to London to stay in your hotel room!
We left our luggage there after check out and picked it up later in the day which was handled very efficiently by the staff. And the free wifi was problem free, I skyped with my family in australia with no drop outs.