3 of us stayed in Whitney's flat for a weekend in London. The room is a big big room (I didn't know big rooms exist in London!) so the 3 of us had a good amount of space. You have your own bathroom with a shower over a tub, and you will get your own key to come and go as you please. We spent little time in the room, because we were always out exploring!
Location-wise, we found it very convenient to take the bus (5 min walk) into the city center -- it's slower than taking the tube, but more relaxed and good for sight seeing.
Also hosting us were 5 cats! 3 permanent cats, and 2 kittens. They are banned from your room, and as a previous review wrote -- It's amazing that somehow there is not a trace of cat inside the room at all! But nonetheless, if you stay here, you should really really like cats. Don't worry, you can play with them outside in the common areas. Whitney was a very communicative host, very flexible with our schedule. Good value.