It’s a tough choice. I have been changing my mind on a daily basis for about 2 weeks now. I had to move my 3D printer from its ideal location (enclosed space, no drafts, where I had just installed a nice solid level, vibration-free surface) to have a ventable spot for the GF. Just happened to also have a vent to the outside (to accommodate a free-standing AC while it was briefly used as a nursery for my infant grandson).
Ideal spot #2 for the GF is where a stove used to be in the kitchen of the 2nd living area in our daylight basement (now serving a my craft space and playroom for the gkids when they visit). The stove’s vent fan vented rather uselessly into the cabinet over the stove. The wall behind it is concrete. And mostly underground. Not impossible to get a vent through it probably, but a little beyond my capabilities. The windows I could go through are over in the play area, so not ideal location-wise.
So…yeah. All that free stuff to burn holes in would be really, really nice. But then I’ve gotta figure out how to make a hole through the concrete wall Argh! This is HARD!