We did not stay even one night in this hotel. It was unseasonably warm in London. The air conditioning was apparently broken, though we were not warned about this ahead of time or when we checked in. The hotel had the windows open, which probably would have been okay, except that there seemed to be a dance club right below us. We closed the windows, shut the curtains, and turned on the AC, but it was blowing hot air. We called downstairs and the front desk informed us that the AC was broken. The hotel was very apologetic, and allowed us to check out without charge.
Assuming the AC normally works, this was probably not something that normally happens, but I feel like the real issue was not being informed ahead of time.