I've been using one of these for the past four years.
https://www.backcountryedge.com/backpacking-and-camping-gear/tents/backpackin...It's a little small for two ( most 2 person backpacking tents are) but is a really nice solo tent. Strong, shock corded aluminum poles that fold down to about 18". Simple to set up. Free standing. Once it's assembled you can pick the whole tent up and move it around if necessary. I still stake it if there is much wind but it isn't necessary in calm weather. Packs very small. The stuff sack that comes with it is about twice as big as it needs to be. I pack the poles separately and the tent and fly fit in a waterproof stuff sack about about a foot long and 6" in diameter.
I've never carried it on my bike. Most of my camping is either canoeing of backpacking in the Adirondack Mountains, but I'm sure I could carry it and the rest of my backpacking gear on the bike with no problem.
Ventilation is good; lot of the body of the tent is mesh. I've been out in some pretty heavy rain a couple of times and with the fly on, and staked down, it's stayed dry inside.
My only real concern is that the material the floor is made from is a bit thin and might puncture if you are not careful about what's on the ground where you set it up. I cut a piece heavy clear poly an inch or so smaller than the dimensions of the floor that I lay down first and then set the tent on that.
I bought it from the place I sent the link to, but I only paid about $90 for it four years ago so the price has gone up a bit. Even for the price in the link I think it's a pretty good tent for the money.
P.S. I just looked at the link again and realized that the stuff sack that comes with the tent now is different from the one that came with mine. The new one actually looks like it might fit very nicely in a saddlebag.