The place is space enough, so that's good considering it's London.
However, you can hear absolutely everything going on outside and inside, which is a problem overall when your neighbors seem to have made a hobby of stomping around and throwing doors. Not even earplugs helped have a better rest.
The shower is tiny and there is no place to leave soap or shampoo, and my tall boyfriend has to crouch to get in and didn't even fit well.
On the check-in side, they insisted multiple times in a time of arrival, which had us hurrying to get there in time, and there wasn't even anyone there to receive us. If is was just codes you could have just told us and we could have spent out day more calmly. Could see a lot of people in the same situation over the days, looking lost, because STK doesn't even have a messaging app contact.
Now that I know London better, I would have rented something cheaper and more personalized, even if further from the city. Transport works great, FYI!