you get what you pay for with no unpleasant surprises :)
for London - it's fairly affordable accommodation, so don't expect anything fancy. at the same time - the linens and towels were clean, the bed was ok, and the bathroom was pretty clean as well. my room was really small, but again - that's exactly as described :)
Lukas is very communicative and will accommodate your needs if possible (for example I forgot a micro-USB cable and borrowed one from him).
The only real downside was the window. It's single-glazed, so you can hear every car passing by. I bought myself some earplugs, which fixed the problem. The second thing about the window is that the provided blind does not cover the whole window, so it gets pretty bright fairly early. If you're not a light sleeper, like I am, you're gonna be just fine :)
Overall - I'm happy with my stay.
Cheers!