A mini crib is definitely a space saver. Just please remember that a small nursery should also be a safe nursery. The crib that you choose should be reliable and made to last, while the mattress should also fit snugly inside the crib.
The crib mattress should also be the best possible mattress that you can afford. I recommend organic.
The idea for this crib came from the standard sized Emily Crib, and there are many parents thankful for that, including myself. I would recommend getting a mattress pad or a higher quality mattress to go along with this crib. This crib can be put almost anywhere, and can even be coverted to a twin bed if need be. The best part, this crib very reasonably priced.