Arpenaz 4.1 Fresh & Black (ID 8731616)

I have this one too. For 3 people 7 to 10 days is doable but will be a little cramped. I find this tent to be perfect for two because it gives plenty of room to get up to pee while not waking up everyone and also the "lobby" of the tent will get very cramped with cooking utensils and the gear of three adults.

I had that in fresh black , inflatable . Plenty space for a family of 3.

https://www.decathlon.co.uk/p/4-person-camping-tent-arpenaz-4-1-fresh-and-black/177332/c98c335m8731616 I can't recommend this one enough, easy to set up, not too big, Plently of room for 2, stays dark in the mornings and cool in the heat. Edit: Just seen someone post the 3 man one, also a very good tent but might be a bit cramped with two of you.

https://www.decathlon.co.uk/p/4-person-camping-tent-arpenaz-4-1/4123/c98c241m8648383 Buy the cheaper one, I must be coming up to the ten year mark on mine. Spray waterproofed it a handful of times, packed it down wet, store it outside, not been precious with it at all. Survived torrential rain, wind and sun. Incredibly well ventilated. Very light for it's size.  If 3 of you sleep on the floor and use the front porch as storage for your gear you might be alright but for the length of time your talking id buy two at least. 

I am literally standing next to an Arpenaz right now. Looks solid, and easy to setup.