personally i would be inclined to go and have a look. Stuff such as bathroom leaks are really in your best interest to repair - where is all the water going to? WHAT other damage is this leaking causing? Personally i don't think leaks are the fault of the tennant. Re toilet seat, you would think they could just get a screwdriver themselves, but perhaps they dont have one?
Obviously i can't see it, but o wouldn'y have thought peeling paint would cause loss of enjoymentt of the house, however, as i said it's in your best interests to maintain it, and if they are good tennants, it's not worth losigj them over small jobs like this