How about considering a pony wall with a planter top, it looks like the space gets a lot of light?

No point to that. When guests use the space? Everyone else in NOT using the space. Done. You can't get enough "privacy" for it to be private unless you use a WALL. If I'm a guest, do I want your kid in there watching tv with his or her friends, or using the computer? Not really.............................and a teen guest cares less on privacy. They can sleep on a picket fence.

I would not worry since it is a guest space when you have guests so everyone will have to watch TV somewhere else.

I wouldn't dissect the room, it's pretty cool, I'd be wary to overthrow a balance

But I understand your sentiment. What about some folding screen that can be put away when not in usage?

(was considering it myself,,just everything I really like is too expensive, and no real room to put it when not in usage lol. We do have a separate guest room for now, but when it's overflow of guests we put them in a family room-it's not open to others spaces except enrtance, but still..just a bit more of privacy would be even better)