I personally keep it at my bedroom. I've got a small mining rig of 4 msi gtx 1060 cards which are sitting on the other side to my bed.
They just have two fans and don't make much noise. They've been a few months with me so I don't mind them any more.
Since winter is coming I don't get bothered with them and even in the summer just a fan was enough for me since I live in a tower and leave windows open for most of the time.
I really can't figure anywhere else. That's the only place I have since there's no garage and balcony isn't safe from rain.
I notice no mention of a spouse/mate. Bedroom/public spaces work much better if you don't have a wife(or hubby) and kids...
Wife doesn't like the noise (although she did tolerate the dining room being taken over for a while) and the kids destroy everything!
Seuss