If you want to stay near the Frankfurt Hauptrbahnhof, this is the best hotel for the money. It is easy to get the the airport by train in like 20 minutes from the hotel, so it is good for early morning flights.
The Hauptbahnhof and its surrounding area are not very appealing, so access to transportation is the primary selling point for this hotel.
In addition, the street that the hotel is on leads away from the Hauptbahnhof to a small park and the Meridian hotel behind it, which make it easy to get away from the somewhat unattractive folks that gravitate to the train station and walk into a fairly pleasant residential area or down to the river.
The hotel has a pretty good breakfast from 7 am to 9 am. For food at night, I would recommend the Irish pub around the corner. Apart from that, it is sort of limited.