Hotel is cheap. Well located S1 or S11 from airport for 2.50euro, hotel right outside wehrhahn station. One stop down to HBF, or jump on a tram.
Staff friendly. Internet not free even as guest. Breakfast ok, not always refilled (buffet).
Bad part for us was that the room was next to the tracks and very hot (no a/c), plus curtain didn't cover anywhere near all of the windows (room 509). Frequently woke up from being too hot, room being too bright, or - most normally - by a train going past.
It's ok for the price and if not in peak summer it wouldn't be so hot so windows could be shut and some noise problems reduced.