I would like to add this:
Folks said that tinting windows helped with keeping the heat out...I disagree you could still see in and they felt like huge radiators
I tried limo tint,then said screw it and painted the back ones black they look good from outside and you cant see in at all...same problem as above...huge radiators the heat was unbearable.
I had some left over flat white from something and said "I wonder" I rolled on just a quick coat over the black and that made a huge difference...dunno why it did tho'
The bedroom is very dark...open the windows and it becomes a different room...so I can understand the concerns you have about the "cave" look.
I plan to cover the lower window sections with bubble foil and panel over that to help keep the heat out.