This is an interesting question, largely because I have been wondering this myself a lot lately. I used to read constantly, and I wrote a lot more as well. The fact that I do not do so as much now bugs the hell out of me, and I occasionally have spurts where I try to get back in the habit of doing both.
I have, for example, been using my phone to compose posts for this blog. For some reason I am finding that particularly frustrating this morning, but I think I just sorted out why. Anyway…
My perfect space for reading and writing would start with a chair I can sit comfortably in for long periods. I assume that sounds basic, but the fact is I have not been able to find one in a very long time. Either the chair starts to hurt my back after a while or I cannot hold a book at the right angle.
It would have a small fridge for beverages and snacks, and (of course) a coffee maker. Preferably one attached to a water line for minimal refill effort.
It would need to be cool and cozy. A fireplace would be nice. A room with a nice view where I could contemplate nature when I felt the need to pause and reflect for a few. Someplace quiet, with minimal distractions and perhaps built inside of a faraday cage so the internet would not follow me in.
I suppose none of this is terribly original but it sounds pretty great to me.