The host company did an excellent job of managing this transaction! We appreciated the many clear communications. The staff at the Signature at MGM is also super helpful and the buildings and rooms are more than acceptable. Overall the service level was excellent.
These units are privately owned. We were there with a larger group who had rented two larger condos together, and chose to have our own spot close to them.

A couple of things to be aware of: there is no self parking on site. If Valet parking is full you are forced to park at the MGM Grand and walk back. . It’s not close. You won’t want to need your car while you’re there.
This being the Vegas strip, food, water, and essential items are ridiculously priced on site. Bring a cooler with water and food or other supplies you may want for your room if you can.
It’s quite a hike to the strip, both through the MGM casino and via the side street, Harmon. If that’s an issue for anyone in your party, you’d be better off staying somewhere with direct strip access. It wasn’t terribly hot the weekend we were there, so we did ok.
We stayed on a weekend and after accounting for the Airbnb fee and the cleaning fee, did not find this to be more affordable than a hotel room across the street. However the room was larger than some, and the kitchenette was handy to have for the refrigerator.
Also being the strip, and even being a few blocks away, the noise was constant day and night. Don’t choose this thinking it will be quieter.
Overall if it meets your needs it’s an enjoyable stay.