My colleagues and I, booked the Ramada Messe in Frankfurt, cos we had been there already last year and all went absolutely well.
Not so this time: at the hotel they did some overbooking (selling more rooms than they had available), and once we've got there, we were told that they didn't have our rooms available and we needed to move to Hotel Ramada in Bad Soden (20 minutes' drive outside Frankfurt, with good traffic conditions)
I'm not going to explain the tons of words we had to say just to try and sort things out and when you're at a hotel for business purposes, the last thing you need are troubles, because you are already WORKING 12 hours a day at the exhibition.
The personnel at the Ramada Messe, was very unfriendly and helpless. On the contrary, everyone at the Ramada in Bad Soden has been extremely kind and helpful even if the problem wasn't theirs.
Next year we'll book our 5 rooms somewhere else in Frankfurt