I recently stayed in this unit during a long business trip. For me Las Vegas is not the ideal place to spend 2+ weeks, but I was very fortunate in that my host made me feel very welcome and comfortable. Further, the MGM Signature is a much quieter facility, with no casino or smoking allowed, so I had the convenience of being nearby my workplace (convention center) without the disturbances from the Vegas crowd.
The unit was spotless, spacious, and well-provisioned. The extra sets of towels and sheets were very convenient, and it was a relief to never return to the room only to have to wait for the maid service to finish. The guest laundry facility was also a huge help: I was able to pack a small bag for my 2 week trip and wash everything quickly in the 4 sets of machines provided.
As a business traveler, I cannot overstate the benefits of having a kitchen: nothing takes my blues away like being able to whip up a meal after a long day. Eating in Vegas can be expensive (99¢ shrimp cocktails disappeared in the 90s) so this is also a great way to economize.
My only gripe is parking. Valet-only properties are as annoying as bathroom attendants. Fortunately valet is free, but it still is inconvenient.
All in all, this was the best Airbnb experience I've had, and one of the best Las Vegas stays I've ever had. I will definitely return next time work takes me.