It is in the attic, but it is done very nicely so you won't even notice. Very clean. Nicely decorated. Tons of light through several sun roofs which makes it feel very nice and open, even in the bathroom. Full kitchen to use as well. Very conveniently located near two tube stations. Hosts were very responsive and also very helpful with tips for the area and London in general.
Being an attic, the bathroom was very small and a bit hard to use. If you need to do a lot of makeup/grooming in prep for a fancy event this could be a problem.