Anyone have a wall/murphy bed in their home/apartment/condo/boat/wherever?! We've been exploring the idea of putting on in our 2nd bedroom so it can (one day) be a nursery but also have space as a guest room and be more comfortable than an Aerobed.

Tacky? If so, other options or recommendations?

Do you have one? Are they expensive? Where do I begin?

ETA:
Attached is the style we've been looking at (first photo). The bed opens with the desk in place and everything can remain on the desk too! I don't know how much more it is to add the shelves next to it though. I also like the 2nd photo and would put a small desk in front that can be moved when the bed is needed. DH isn't as sold on that idea though.