Pretty poorly kept hotel for the standard you're expecting from it. Coffee maker hadn't been cleaned in a year probably. Shower had missing pieces, and wasn't clean. Sheets had one stain on them (but were generally fine).
Hotel restaurant didn't have any food, only drinks. No restaurants within walking distance that I found. I had to Uber eats in McDonald's.
For the price and the above options, if you're in Frankfurt on a layover, get a hotel by the airport.
It cost 30-40 euros each way from the airport to the hotel, but you're not really in the "center".