Paddy

If you zoom out a little on this map you'll find the railway station towards the bottom right of the map. Find the entrance to the station and follow the road outside that runs to the north west and you'll find the Messe nearby. Its only a 10 minute walk from the train station. There are lots of hotels in the vicinity. From the map you should also be able to find the city centre. That's probably a 20-30 minute walk from the Messe iirc.

https://www.google.com/maps/d/viewer?mid=z8f0Sbq2I9XU.kI8_FY90V0hI&hl=en_US

Don't worry about being close to the airport, its a bit out of town but only a half an hour or so from there to the Messe.