The word I would use to describe this flat is adequate. Probably you aren't planning to spend a great deal of time hanging out in it if you are visiting London, right? If you're looking for a good base close to transit and in a relatively quiet area, this is a good choice. However, for the price, we had expected a little more.
Pros: great location, close to public transit, not too noisy (neighboring pub closes at 11). Great communication with Emil. Wonderful bathtub. Very spacious bedrooms (kid bedroom smaller). Comfortable beds.
Cons: smoke comes in the windows from pubs and downstairs neighbors (we were there during the heat wave, so this was an issue!). House could be cleaner / better maintained. Issues like dust, stained carpet, peeling wallpaper, noisy toilet. Not a big deal, but gave the overall feel that the flat was not as nice as we had expected. As others mentioned, both bathrooms are on the top floor, but only one bedroom is on that floor.
Overall, we still enjoyed our stay but for the price we paid, we had expected a nicer place.