It's not a huge museum, but the Albertina packs a lot of world-class stuff. If you're into…read moreImpressionist art, you'll find a good amount here. The "Monet to Picasso" exhibit is well-curated and you'll definitely enjoy their collection.
The special exhibit they had during my visit was a modern art one, which isn't much my interest but definitely a change from their regular exhibits. Additionally, the museum has staterooms from the old Habsburg days.
If you only have time for one small museum in Vienna, this one would be a very good choice.