Has anybody called Autovermietung Arndt? The Model 3s are not available on their website, yet. Also I wonder how they are supposed to be charged. Superchargers are very unlikely (see You You's Tesla Model 3 Road Trip) and using an adapter from type 2 to type 1/US Tesla can result in anything between 3.7 and 7.4 kW (depending on your charger) but not more since AC is limited to a single phase for US Teslas. They also have no Internet connection. So no updates, no real navigation. No parts, no service, no support.
Internally there are three chargers at either 115V*48A or 230V*24A and for Europe they will be all connected seperatly to either a type 2 or a CCS type 2 plug, hence 16.5 kW max. in Europe. In a US Tesla it appears those three chargers are all in paralel and go to a single phase input. It would be theoretically 230V*72 A with all three chargers in parallel. I can't remember if that can be achieved in a Model 3.