It's not bad, but the management policy is stingy. There's no late checkout even if they have plenty of room.
I asked and got very bad instructions to get there. Here are better ones: Take the S8,S9 local train to the first stop in the direction of Frankfurt, which is Gateway Gardens. Purchase the ticket (cheapest one-way Eu 2.25 at time of writing) in the green booths one floor above the level of the platforms. Attention, amazingly at the Frankfurt airport there are no escalators or lifts to the train platforms. Typical German thinking: they miss the forest for the trees. Entschuldigung, but it's true.
About the hotel, it's an average three-star hotel. I didn't like that I had to pay for the kitchenette that I didn't use. I despise the no late-checkout policy, which is so stingy. Other reviewers said they had problems with the air conditioning. Ditto here, except for me it was the Fall and I couldn't set the thermostat above 19 oC. I had to take a shower to warm up and to run the hair dryer.
The best part was the breakfast. It had a very good assortment of cold and hot dishes, pancakes, fruits, and vegetables. It was better than at four-star restaurants in the Bilbao-San Sebastian Basque region in Spain, where I just came from.
This could be a great hotel, but the management is stupid.