Tourismus und Congress GmbH Frankfurt–Main has its main office at Römerberg 27, in Old Town. It's open weekdays 9:30–5:30 and weekends 9–6.
The airport's information office is on the first floor of Arrivals Hall B and open daily 7 am–10:30 pm. Another information office in the main hall of the railroad station is open weekdays 8 am–9 pm, weekends 9–6. Both can help you find accommodations.
Tourismus und Congress GmbH Frankfurt/Main. Römerberg 27, City Center, Frankfurt, Hesse, 60311. 069/2123–8800; www.frankfurt-tourismus.de.