A good midweight (about 10 lbs) foldable stroller. We had one by coombi, folds up small, has a sun canopy and a basket. It collapses like a regular stroller then folds in half after that.
Small enough to maneuver in the hallways yet big enough to be sturdy, have storage and give a smooth ride.
With all the "baby stuff" I've purchased this was the most used item (I think it was $60).
Only complaint: DH is tall and it was hard for him to push as the handle is not very high (he never pushed the bigger one either!) I'm 5'4", it was fine for me.