I picked this flat because I wanted to do all the standard London tourist things while walking to most. The location is the single greatest quality about this place (the rest is great too). It's a 15 minute walk to Parliament, Buckingham Palace, and the British Museum. 5 mins from both Leicester Square, useful Tube stations, and Trafalgar square.
Positives - Very quiet (double windows), 24 hour Tesco nearby, Spacious, Nice bed, amazing water pressure, nice bathroom, comfy couches, and very clean. It also features a washer/dryer single unit which unfortunately broke while I was there so I only got one load out of it, I had to get my flight right after that so I can't judge how fast they repair problems. The nightlife nearby is amazing, great restaurants and fun looking pubs (I don't drink).
Minor negatives -
1. If you are unable to climb stairs this flat is 3 flights up, 2 of the 3 sets of stairs are narrow and steep.
2. Very dim lighting at night because of mismatched bulb color temps, low wattage, and strange placements. This isn't huge but I wish it was brighter.
3. The shade directly across from the bed doesn't cover the entire window, there's a 3 inch gap on the bottom where the sunlight just shines right in your face while sleeping.
Summary: You are paying for location. I went for the British Museum and found the walk delightful and short. While you might be able to get cheaper, near a tube line, further out that's still time waiting for a train, travelling, etc.
While I was unlocking the main door on night a guy drinking at a pub pointed at it and asked "Is that your place", I said I'm staying here and he replied "amazing". He was in shock about the location and he lives in London.