I went to Frankfurt for a conference. Colour Hotel was great, really near the Messe and the central station. I didn't need to take bus or underground to move. Breakfast is the standard international one, but good and in a nice (and colored) room. Room was comfortable and really big, quite clean. Good wifi free hot-spot. A really nice hotel for a work-travel, especially if you have to go to the Messe.
- Free Wifi