MERCURE FRANKFURT CITY MESSE. . The Mercure Frankfurt City Messe is located centrally between the main train station and the exhibition center. The train station is a few minutes' walk away - or take the tram, which stops right outside the hotel. From the main train station, you can rea ch the airport approx. 12 km (7.5 miles) away in around 15 min. via S-Bahn lines 8 and 9. You'll also find a connection to the U-Bahn network with access to lines 4 and 5. By car, take the A5, A66 and A661. Park in the hotel's indoor car park for a fee.