I've only stayed for one night, but it's a great place and will definitely use it again if I go back to Nottingham. It's literally just opposite the train station, so super convenient, you do hear some traffic and people, but that's pretty much done by 10-11 pm. It certainly didn't impact my sleep.
The bed was super comfy and the staff were amazing. Really personable and happy to chat, they gave me some recommendations as well and just seemed like they enjoy working there.
My room was at the top floor, so climbing the stairs was just a bit draining after a long day, otherwise I'm super happy with my experience at the Bentinck. Highly recommend!