A kids bed with a slide is very cool! Kids will love being able to slide out of bed in the morning, and it's actually a safe way for little kids to get down too (small kids can be unsure when coming down a ladder backwards because they can't see where their feet are.)
Many of the kids beds with slides also have a tent to create a play area underneath. This gives kids a fun space of their own where they can keep toys and have friends to play.
The advantage of buying a fun piece of kids furniture is that it works as an impressive gift as well as a practical and necessary piece of furniture.
Most beds with slides are mid-sleeper or cabin beds - they're not as high as bunk beds or loft beds. So ceiling height shouldn't be an issue, but do check individual beds against your room measurements.