Did he use a moisture barrier under his concrete when he poured it? That might be the key here to a successful concrete floor for your application.

My kids are 8, 5, 2, and 2. And yep, we have a spunky little mutt that flies in and out right alongside the kids. The doors would be our primary in and out to our deck and backyard, which is the primary play-spot for our kids, as well as half the neighborhood kids, too. And the in and out is constant--drinks, snacks, potty breaks, etc. These retractable screens sound great, but not right for our house and our uses. I'm kinda diggin' the idea of a pair of old-fashioned wooden screen doors, that self-close behind all those kids :) Guess I will have to continue my research...but I'm sure it's a possibility.

First, you are so luck to have such a wonderful getaway vacation home! It is on a beautiful lot. I agree with missymoo as well, and also what Olychick said. Something about that table smack dab in the middle of the room seems to block entry into the screened porch. I love the idea of a sofa against the wall, something like what robo posted with some comfy cushions and arms, and a chair for reading with a footstool that could also double as an extra seat. Add a small cocktail table you can also use for a tray of snack food. The bar cart is also a great idea. Encourages people to gravitate to where the food and drinks are. You could also string up some lighting along the perimeter and it would look very inviting. Do you get a lot of sun on the deck? It looks shady so I would think a new round table with chairs for seating would be fine and then move your grill & the pub table out there. You can get some pretty nice chairs that swivel and rock. I have also seen some benches that double as storage for the cushions so that might be an option if there is room. That would keep cushion maintenance down for you when you aren't there.

There are companies that specialize in converting covered porches or screened-in porches into 3 season rooms. We just bought a house that was initially constructed with a covered porch on the back side of the house, and the prior owners used a company like this one (link below) to convert it into a 3 season room. I absolutely adore the 3 season room, it was one of the best features of the house. 2 sides of it are basically all glass, mine looks almost identical to the last before/after photo in the link below. I adore sitting out there. I have no idea if this company is any good - it's just the first link Google came up with for me as an example to share. https://www.patioenclosures.com/patio-and-porch-conversions-before-and-after.aspx