I can't really help on the mattress, but we have a smart base for our bed, which serves as the frame and the boxspring in one, and we love it!. It is simple to set up, lightweight, but super sturdy, but way cheaper than a traditional boxspring and inexpensive frame. We have a queen now, and when it is time to get a bed for our (currently 18 month old) daughter, this is what we will get for her as well.