Nothing against the AirBnB themselves, just an observation. You are almost forced to use the valet service if you want to use the convenient drop off location of MGM Signature. If you don’t use valet, the valet drivers flip a switch and are rude and actively try to inconvenience you while you try to check in.
ProTip: there’s yellow curb areas near where you can load and unload by each tower to avoid the Valets.