Babenhausen is a bit out of the way for most places, but if you need to stay overnight -- don't stay in Frankfurt, take the half hour and go to Babenhausen. The hotel itself is spacious, pet friendly, well-kept/modernised. The restaurant attached to the hotel is very tasty. All within a 5 minute walk there's bakeries and other restaurants/pubs. It's also a 5 minute walk from the train station and Babenhausen is on the main train lines from the Frankfurt airport.