I've no experience at all of Air B&B, but just wanted to say that we've been to Hull twice recently and really enjoyed our visits. It gets a rough press still, but we had some interesting walks round the city and were impressed by the museums and art gallery (all free), and the people were so friendly - on two occasions when we'd got the map out someone stopped in the street to give us tourist tips. The second time we stayed we opted for the Wetherspoons Hotel, really just because I was curious about them. I must say it was excellent for the (extremely cheap) price, and very well soundproofed, which to be fair it needed to be - we had a lively couple of hours in the bar after our Bob Dylan gig before leaving them all to it and retiring to our quiet space upstairs!
Returning to old haunts? That's always been a positive experience for me, as they've usually been spruced up a bit since I left, in a good way.