Having 13 grandchildren, one of the challenges is, "Where is the baby going to sleep when they're visiting?"
We had used play pens over the years as well as the fold away wooden little cribs. Those can really get in the way to store and put away when not in use. But recently I have been using the Graco Pack and Play Play Yard. It comes with it's own back to store away and I can keep it out of sight when not using it or bring it out when the little ones come to visit.
Our youngest grandson is not quite 2 months and another one is arouind 11 months. So this suits them perfectly. What I like about a little baby (up to 15 pounds), there's full-sized bassinet that I can set up and use. It's sturdy and even allows for me to rock back and forth if the baby is not quite asleep. When they pass this age up, or the other little one comes to visit, it can be removed pretty easily and put away and then put the padded cushion on the bottom. It's deeper and lower so that even when a little one is beginning to stand up, it is safe and they cannot get out. Also protects them from other toddler grandchildren from touching or waking them (except if they shout and holler ).
It has mesh all around for better ventilation and I can see them if I happen to be sleeping in the room with them.
It's easy to clean up with with good old soap and water and the removable sheet can be machine washed as well.