We had a good stay here. The shower was great, if a little confusing to figure out at first, and the beds were very comfortable. There were no trash cans available, so we just used plastic bags for our rubbish. The doormen were very nice, though we had a slight issue getting the keys initially, due to one of them forgetting to file the paperwork correctly that we were staying. She was very easy to communicate with when this came up though.
Anna's place has a great location in East London. Because it's in a high-rise apartment building, there's a nice little balcony with a great view (and cool breezes at night for when it's hot).
There's one big thing to note when staying in this area, however: At the time we stayed, there were apparent all-night/weekend raves that took place in the surrounding neighborhood, with incredibly loud, bass-pounding music through all hours of the night. Unless you're a heavy sleeper, or plan on getting wasted every night, these will undoubtedly make it tough to fall asleep and stay asleep.