I would actually give them 4.5 stars but Yelp won't let me do that.
I actually had my stay at the Aria recently and am updating my review based on that.
With respect to the credit card issue, it took about 3 weeks after cancellation and a post on Yelp to get this rectified. I still recommend watching your credit card statements because they were definitely a surprise.
The hotel itself is pretty nice. It's a newer hotel compared to the Bellagio and you can see that during the stay. The bed is as comfortable as others have noticed and the rooms were clean.
The food selection at the Aria is fantastic. I am one of those folks who hates dressing up but still likes having nice dinners. Most restaurants at the Aria allow casual dress but still have excellent quality.
Happy Hours are plenty. A number of the restaurants on site have happy hours with discounted food and drink.
Awesome spa. I bought a pass to use the spa facilities (around $30-$35) I believe. The spa facilities include use of a private pool, multiple Jacuzzi's (Cold, Warm, and Hot), sauna and eucalyptus steam room, salt room, and Japanese Stone beds. All of them were awesome. The amenities are also some of the best I have seen out there.
There were some things that kept me from giving them the full 5 stars. Most of the reasons are based on my past experiences at the Bellagio. Both are MGM properties and both are AAA 5 diamond award winners. Here are some things that the Aria does not do:
1. Turn down service is not done for standard rooms
2. Location. It is a little more of a challenge to get anywhere outside of City Center from the Aria. Even with the train, it's still a pain to get anywhere
3. Level of service was kind of dry. Not sure what it was but I didn't feel as though the staff was willing to do what it takes to make a customer happy.
I'm glad I had a chance to try the Aria out. I will definitely be back for their awesome restaurant selection in the future and possibly stay there if the price is right.