I use an indoor rabbit cage. I have 1 guinea pig, so there's no need for extra space. But, she does have room to run around and stretch. The cage includes a water bottle, igloo (We got it for her when she was a baby Aweee), Hay Dispenser, white food dish, litterbox (With Planet Petco paper pellet litter), and a potty tray. We have newspaper on top of it and her #1 drips down. It's probably the easiest cage to clean i've every had. Literally takes 2 minutes. Replace the newspaper and Litter, Fill up water bottle and food, and rinse out the potty tray.
Super Easy! I bought it from my neighbor's rummage sale, so I don't know the brand, but the bottom (Potty Tray) is green, and its pretty big.