The Vista is a cool-looking lounge conveniently located across from the Colosseum. It has dark décor, and both large and small seating areas in addition to the bar. The décor gives it a comfortable feeling. Along the walls, there are "windows" providing views of different skylines from around the world, but they provide no real ambiance to the room. There is also a DJ off to one side playing music at a nice volume.
Unfortunately, there really isn't anything that sets the Vista apart from any other Las Vegas cocktail lounge. The service is above average and is provided by nice-looking waitresses. The drinks are tasty and hand-crafted, but are way overpriced.
It's a nice place to stop in for a drink, but for the prices you can do much better.