I stayed at Chapter for approx 4 months while I was back in London temporarily (April-July 2021). Great location, close to everything you need. Helpful staff, clean room and well-maintained common areas.
As others have commented, the rooms can get quite hot, especially if you are on the side facing the City (afternoon) and a bit less so the side facing Stratford (in the morning). But there's a common area on the ground floor with excellent AC.
Yes, it's a student building, but in the time I was there, I didn't really experience too much noise. Overall, I'd recommend staying here, and I will probably do so again for future visits.