Since this is a guest room, I like the idea to have a multi use area, that would give guests(especially longer term guests:) the option to retire in the privacy of their quarters when needed.
This could be a reading nook/extra storage/coffee nook/laptop work area.
You can avoid the built ins. Start with a comfy 5 ft bench that can be a storage bench as well
Then layer a small footprint cafe round table with one or two skinny chairs.
Here is some inspiration:
If you cannot wire in lighting you can use a plug in or battery operated wall mounted sconce/lamp
Q