Had such a great stay here. Easy access to the strip (10 min indoor walk to the MGM, 10 min walk outdoors to PH), simple check in/out instructions and the place was just as described.
In terms of COVID related precautions, masks are required inside and people socially distanced for the most part. The door to the room had a seal to show it had not been entered since it was cleaned.
There is valet, but it closes at 1030p (might be a COVID precaution). We arrived at 1a Saturday, so we were instructed to temporarily park in the roundabout drop off our belongings (bellhops are also available) and park the car in the parking structure for the MGM Grand. As mentioned, this wasn't a terrible walk. We just grabbed the car in the morning and brought it over to be valeted. We waited maybe 10 min max for our car upon check out. Very efficient!
During our stay, the lazy river in the Grand was closed, but the pool for the Signature was open with limited capacity. All casinos, except for PH were also open with requirements for masks, plenty of hand sanitizing stations, and limited capacity at tables and slot areas. Restaurants were also open for indoor seating at limited capacity. Overall, I'd say maybe 70% of people were wearing masks -- most folks walk around while drinking, so they just keep the mask off.
Would stay here again, 100%!