We have a 3 man pop up tent from Decathlon, and I thoroughly recommend it. It isn't huge, and we can't stand up in it, so have to dress kneeling, which can be awkward.
But it fits either a kingsize air bed, with just enough room at the side for bags. Or it fits 2 single camp beds with matresses (bags stored underneath), and a section down the middle. The 2 beds works best as you can sit down on something solid, making getting changed much easier. It also takes about 5 minutes to put up, including pegs and guy ropes.
It's blackout, double skinned, very warm and cosy through the night, but ventilates well and doesn't over heat if it's hot. I always sleep really well in it. I've not had any issues with condensation, and it's never leaked. Also has a tiny porch area, which is good for sorting out boots/coats if it's raining.
We've had it for several years now, and it's been dragged to a minimum of 2 festivals a year, usually more. The bag it comes in has a long adjustable strap, so for festivals I sling it over my back, and walk along looking like a turtle. But a turtle who has her hands free for other things so doesn't have to do a second walk to the car!
https://www.decathlon.co.uk/p/instant-3-person-camping-tent-2-seconds-xl-fresh-and-black/352655/m8871289