Not bad for a youth hostel. I booked a two-bed private room for my friend and myself to split. It was comfortable enough, and it was nice having a wash sink in the room so that we didn't need to go to the shared toilets every time we needed a sink.
The beds had built-in power outlets, however they didn't really work well. We ended up using the wall outlets to charge our electronics. We were also right next to the showers but one of them was out of order. The toilets were at the end of the hall but one of them was out of order as well, so I ended up needing to wait for one to become available a couple times.
It wasn't too noisy considering we were facing a busy street and some people complain about the bells coming from St. Paul's being distracting as they ring essentially every 15 minutes, but I got used to it pretty quickly and was able to sleep just fine.
Wifi is only available in the shared spaces and not the rooms, so that might be difficult for people who rely on wifi connection.
We didn't take advantage of their breakfast offerings, though they seem to have a nice variety of hot and cold food to choose from. They even seemed to have a couple vegan items that I could have eaten, but I wasn't going to pay nearly £10 just to only eat like two items.
Check in and check out were easy.
