The room was better than I expected. I came for a convention, so the proximity to the monorail and taxi/uber was my most important criteria. I usually stay in the MGM, but this year my stay stretched out to nine night. It's HARD to deal with a casino for NINE nights!!
I was surprised to find that staying that the signature was more convenient than the actual hotel. It's a 8-10 min enclosed walk from the signature to the MGM's monorail station. However, getting in and out of your room didn't involve any casinos.
Taking a cab or uber was even better. Going from your room to driveway is 2 minutes. It's at least 10 minutes at the MGM.
Everything about it was more convenient than staying at the MGM... including having a kitchen, being able to get grocery deliveries and schedule housekeeping when you needed it.
Also - while all rooms on AirBnb look the same at the MGM signature, they are not. One of my colleagues's rooms (who wasn't booked through Alex) had a room that smelled like smoke and had no maid service options, etc. Look for the rooms that Alex books.
I'll definitely be back... the room was bigger than Las Vegas standard hotel rooms, had a kitchen, more convenient than a hotel room for transportation and less expensive too.