First off, parking. If you are going to be driving to this hotel for a conference parking is terrible with just a handful of spaces by the conference center and most space a walk up a steep hill.
Hotel parking is quite a distance from the conference center. And there is always valet present:
That said the hotel, food, staff and views are extremely good.
The Buttes is located nicely close to I10 and 48th street and somewhat close to Sky Harbor. Far enough away to not suffer noise from the airport or freeways.
Get up close with the natural desert with various small outdoor areas.