Playpen

Anyone have any recommendations for a good playpen that is suitable for an apartment? We don't have a ton of space, but a playpen would definitely be helpful for us since little girl is getting more mobile and rolling around everywhere. Would love to find one that isn't too large but still a decent size for room to play, and can be constructed and deconstructed easily since it can't just live in the middle of our apartment lol. Any ideas?!