If you're low on space, but like having guests over this couch would be nice option. Especially if your guests tend to be younger, this is obviously not something you set up for Grandma on a weekend visit. Well, I suppose that depends on how much you want her to come back sometime.
This couch easily transforms into a bunk bed, giving you two new spots to put someone when they are staying the night. This would be especially nice for those that are just putting a couch in the corner of their home office.
The design even comes equipped with a guard rail for the top and a ladder to get there. The covers are all removeable, making it a bit easier to keep this clean.