It's a great place to stay if you just need a place to crash near an underground station. It's nothing fancy, but for us it was perfect because it's literally a minute away from the Leyton underground. The bed is comfortable, there's enough closet space and the bathroom is fine for a quick shower.
The host was super helpful and easy to reach. When we arrived we had a problem with the cleanliness of the bathroom - there were drops of dried pee on the toilet seat and it looked like it hadn't been cleaned in ages. We texted him a picture and he immediately sent someone to clean it while we were out. After that, it was clean and all was okay.
If you're coming in the summer keep in mind the building is EXTREMELY hot. We could barely sleep even with the fan on, but we were in London during a heat wave, so I wouldn't blame it all on the missing AC.
Also, if you're a light sleeper like my mom I wouldn't recommend staying there - the street is loud up until the early hours of the morning. Maybe in the winter it would be better with a closed window.
All in all, for us it was perfect as we barely spent any time there and it was in a convenient location. There are even multiple supermarkets on the streets open until very late in the evening if you're craving a beer or some snacks.