All of my rabbits have always loved being out on the screened porch during the day. They head straight for the door to go out on the porch early each morning, then they come back in the house in the late afternoon or early evening. It’s on the shady side of the house and there is a ceiling fan, so it stays pretty cool in summer. But if the days are too hot, or too cold in the winter, they come back in the house. Although they like the porch so much, it can be hard getting them to come back in the house.
The flooring is concrete, but we have a piece of indoor-outdoor carpet covering it, plus they have an extra rug in the corner where they like to hang out and sleep, a thick towel under their litter box, and they have 2 chairs with cushions that they can get up in too.
We did put a protective metal grill around the bottom 4 feet of the screen, and the screening is thicker and different from normal screen. I think it was called shade screen.