If your tight on space that 4x4 is kind of an odd size for small rooms. I opted for a 2x2 (Zazzy) tent in one corner and and 3x3 (Mars hydro) tent in another corner of the room so I have a bit more elbow room and can have 2 or 3 in veg and 2 or 3 in flower at any given time. Keeps me busy as I'm not waiting for such big harvests all at once. Just a thought since I've heard you mention a smaller indoor space. Got a mars hydro ts1000 in the 2x2 and a mars hydro fc3000 in the 3x3 and it's working out great so far. If I had more room, I'd love to have a 4x4 but it's just a tad too big for my space.
Look on Amazon for "Zazzy" tents they are WAY cheaper and way more durable than vivosun (the supposed cheaper option) but just as good as Mars Hydro. They feel as thick as mars hydro tents with really good zippers. If I would have known it was such a sturdy tent I wouldn't have wasted money on the mars hydro tent.
(Sorry mars hydro but zazzy is the shit!) I have a 3x3 vivosun tent also that sucks. It's thin and has a shitty zipper. I'm only keeping it for emergencies or if a friend ever wants to start growing.