Express by HI, Moerfelden-Walldorf
This hotel rates an A+. It's the cleanest hotel I've ever stayed in. The desk personnel were fantastic - calm, efficient, helpful. We arrived late, everything was closed, but they had the menu from a nearby Italian restaurant. Food arrived hot and delicious.
Our room was spotless. It had a connecting door to the next room, so we rented it too (only 59 euros), which gave us a suite of sorts. The second room was a disabled bedroom, with a roll-in shower, higher toilet and higher bed, which suited our arthritic knees admirably. The bed linens smelled outdoor fresh. The mattresses were deliciously comfortable, the poof was cozy, and the room was very quiet. We slept like babies !
The breakfast buffet (included in the room price) was extensive and delicious, and is served in a sparkling clean dining room with windows on two sides. The coffee was superb.
This is the only hotel I've ever stayed in that I have NOT ONE COMPLAINT about. I will certainly stay here again the next time I visit Franfurt.