"Our stay at the hotel was great. It's very close to the airport and they offer a free shuttle, which is very convenient. The only drawback during our stay was that the internet/wi-fi signal in our room was extremely weak (room 211), like barely no signal. We complained at the reception during the checkout the next day and they promised to send a technician to check.
Also, it's not very easy to find where the shuttle stops - easiest way is to follow the P29 - Airport Clinical signs when you exit from Terminal 1 - A0 exit.
Strongly recommend the hotel even you stay longer than a day and want to enjoy Frankfurt or want to go for day trips."