ALL IWL events take place on campus:

Johannes Gutenberg University Mainz
Saarstr. 21
55122 Mainz, GERMANY
You can find all addresses, a campus map, and the directions to JGU on these pages:
Well-located hotels of different standards include but are not limited to: IC Hotel Mainz, Hotel Hammer, Hotel Königshof, AC Hotel by Marriott Mainz, and me and all hotel Mainz.
Other options for cheaper monthly room rentals:
List of other options, search platforms, etc. compiled by the City of Mainz:, Airbnb, (rooms in shared apartments), (furnished apartments in Mainz and Wiesbaden), and other larger rental platforms that filter their searches for furnished apartments:,,
The following link that leads to an extensive list of private accomodation (apartments, B&Bs, rooms) in the area: