We usually go there when we visit my family in Frankfurt. The hotel is located very close to the center, just a short walk and you're in the main shopping area.
The hotel is located in a residential area, which means you'll have a hard time to park your car in the surrounding streets. The hotel has a small parking lot for about 5-6 cars and they charge for parking.
The breakfeats is o.k. but check your reservation if the price is included. Usually it is not.
Wi-Fi is free ask for access code at the reception. Our room was at the top floor and we had trouble getting access, so went in the hall way and restarted the router by replugging it - which did the trick.
I agree with the noisy walls, but on the other hand: I wish hotel guests wouldn't talk that loud in the hallway when returning home late at night.More