A puppy playpen setup is great if you have an open planned type of home or large open spaces. It should have a snuggly bed that your pup can snuggle into. I like a bed with sides so if there are any drafts, the pup is able to get away from this. There should also be a portable toilet of some description. I like to use a couple of puppy pads with a grass mat on top of them. Your pup has been toilet trained to the grass mat and knows exactly what to do. Now the idea is not to rely on the puppy toilet but to have it as a backup tool for when you miss the cues your puppy will show you when they need to go to the bathroom. There should be a non spill bowl with water and then a couple of toys. Not to many as this may over stimulate your pup. The playpen should be setup in the area where you mainly hang out as a family. The idea is for the pup to be still part of the family but also have an area where they are safe and cannot get into trouble. If your area is smaller and has door ways, then you could use baby gates and confine your pup to one area only. Please do not let them have free roam of the house at this stage. Once your puppy is toilet trained completely, then you can offer more freedom.
A safe place to keep your puppy is in a playpen setup. So why would you want to do this. Well there are a couple of very good reasons.