This was made for a very loved tortoise but could be adapted for guinea pigs with wire or a cover over the top to keep out predators. For me, it would just be an outdoor playtime cage only with supervision.
Living room - decorated in soothing cream and stone shades, with just a hint of colour in the dress curtains. A window seat with hidden storage was added to the bay. Half-height shutters keep the light flowing in, while providing privacy from passers by.