I am using my Colemen Carlsbad 6-person dark room tent this weekend. I will report back later today after I get it setup. They do make a 4-person model. Target has the one without the screened in area for $85 (Coleman 4-Person Dark Room Tent) and Amazon has a 4-person model with the screened room for $188 (Amazon 4-person Dark Room Tent with Screened in Room).
I will try and post some pictures of the inside of the tent today. It's going to be hot and sunny so it should give you a good idea how much sunlight it blocks.
We have this one: https://www.amazon.com/dp/B019YDV12O/ref=cm_sw_r_cp_api_i_-XMfDbZZQF24W
Still gets hot AF but that patio is neat. We rarely put on the rainfly though.