We arrive in Dar Es Salaam in a couple of days and are just looking for a clean, cheap place for a few days to relax. Close to the airport or easy to get to would be great.
Not sure what your budget is exactly, since generally Tanzania is relatively cheap, but when I flew into Dar and need to crash for a few days, I stayed at the Landmark Hotel. It's inexpensive, but not at all shady, and the staff were incredibly helpful and kind.
My friend Leandro, however, crashed at the Transit Motel just across the street from the airport (http://www.transitmotels.com/) and seemed to have a fine enough time! almost 8 years ago