I live in a fairly good area and have nice neighbours on the whole. The guy next door is moving out and is letting his house. I mean we could get really nice people in but of course we might not. My parents had this happen to them and are now living with the neighbours from hell so I suppose I am sensitive to this.
There is no reason for tenants to be any worse than owner occupiers as DH points out and if he sells it you would have the same concerns. It's just that I think renters just don't have the same 'investment' iykwim. I worry if we get young people sharing who might be noisy etc....Or some serial benefit wastrels.
Maybe I am just being a snob or paranoid or both!