Seeing generally good advice here regarding not getting one too small. First experience was a borrowed 9X12. Tight quarters, especially in pouring rain in MT ranforest. 3 people could not sleep on cots in it. In fact only 2 slept on lawn chair chaise lounges in tent, one in the back of a truck. Army cots would have been too big.
We use a 12X12 Eena, 5 foot walls for 2 people, a small table, a stove and gear. Enough room, but not roomy. We can sit 2 other people with folding chairs. You could not get 2 cots end to end.
A friend just bought a 9X2 with stove with the idea he andhis wife would have enough room. Not really so. He wrote recently that he had decided it was the perfect size for one person.
Lay out cots, stove - with heat buffers all around, and oher furniture on a tarp or something of the floor size and see how much aisle space you have. If too cramped, you knock things like drinks and lamps on the floor.
Another thing, most temt mfgrs will note that tent size is stated from the size of the fabric before it is sewn. Seams take a few inches, then canvas shrinks a few times after wetting, so a 12 foot wall may not really be 12 feet when finished.
If you skinp on size you will likely wish you had not.
