For participants who want to book an accomodation for their stay in Mainz, we have reserved a contingent of single rooms in IntercityHotel Mainz. There you can book a business single room for 99€ per night (breakfast included) under the heading „PLATO“.
https://www.intercityhotel.com/hotels/alle-hotels/deutschland/mainz/intercityhotel-mainz
Further hotels that may be of interest:
Best Western Hotel Mainz
Hotel Königshof Mainz
http://www.hotel-koenigshof-mainz.de/
Hotel Am Römerwall Mainz