Took my first dance class (jazz) with Emily at OIP, and it was pretty fun!
I've taken classes at other studios as well, and thought the instruction here was pretty good. I'm used to classes that are 1.5 hours, but this class was 1hr, so obviously we didn't get to do as much as I'm used to.
The class was pretty busy (because of groupon I'm assuming), but not unreasonably full. Everyone had plenty of opportunity to practice different movements and combos across the floor.
The studio itself is pretty no-frills, but there is a shower in the change room if you get sweaty.