--The Good--
Price: You're probably looking at this listing because of the price. London is expensive, so being able to stay in a decent place for around $80/night including the fees is a win.
Transportation: A couple hundred feet from a bus stop (the busses are cheap and convenient; just tap to pay, and it's £1 per ride, no matter how far on the same bus), and about a 7 minute walk from the Aldsgate East underground station, which gives you good access to the rest of the city.
Hot water: Good hot water in the shower!
Host(s): Simon was a really good host, very responsive to messages and gave good detailed check-in and check-out instructions. I would definitely consider one of his properties in the future.
--The "It Depends"--
Bed: I found the bed to be comfortable, but I like firm beds. There's nothing fancy about the spring mattress, but there's also nothing bad about it. There aren't any lumps or anything like that. The pillows were also to my liking. If you require a softer bed or big fluffy hotel-style pillows, you might look elsewhere.
Other guests: There are 4 rooms in this flat, and only one bathroom. I think Simon stated that 3 rooms were booked while we were there, so six people to the bathroom. We didn't have any issues with the bathroom sharing, as it seems that we had different timing than the other guests. On the first night one other party came in late (1am) and we were able to hear them talking and walking around until maybe around 4am. There is a quiet time stated by the hosts, and I don't feel that it was broken by the other guests, but it is something to be aware of and will depend on the other guests. For what it's worth, many Airbnb reviews state that thin walls are a common problem in London, so I wasn't too surprised!
--The Bad--
Location: In retrospect, I wish we would have spent a little more to stay further to the west of London. Most of what we wanted to do was on the end of things, so we ended up with longer travel back to the place than would have been ideal. It is close to Tower Bridge and the Tower of London, so it's convenient for those, and your mileage may vary on that. The worst part about the location is that this room faces a busy street, which is pretty audible with the windows closed and curtains drawn. If you are a light sleeper I would avoid this room.
State of repair: The hose from the shower head to the wall was a bit leaky, which I think made the shower pressure a bit lackluster. Also, the laminate flooring in this particular room was in pretty bad shape, which was not shown in the listing's pictures. I mentioned this to Simon and he said he's look into the wrong picture being used on the listing. I also hope he works on the floor.
Stairs: This is a third story room, and the stairs are narrow and steep. It was a bit of an effort to haul our luggage up to the room and back down, so keep this in mind if lugging a 40 pound suitcase up 2 stories would be a challenge for you.
Towels: Only bath towels were provided. I would have appreciated an additional hand/face towel as well.
Overall, I'm not sure I would stay here again. If I was doing things mostly in the east of London, I would consider it, but otherwise I would probably spend a bit more on a place further to the west and a bit nicer.