Dear client,
I provided two possible solutions,
First one is more compactible for one person living and probably for remote job,because there is larger working area.
Second one, as I see it, is for couple or just two person living, because there is included separated sleeping area.
Surely I think both of the solutions are beneficial for airbnb and long term living.
As for the bathroom,if it is possible, making a small window behing shower tub would be perfect, but if not extractor fans would also do the good job.I also provided simple drainage plan just to be clear that I made ,,double walls" (mask) around drainage column to hide the drainage pipes (left are drywall panels on balcony,and right 12cm brick wall).
For any addititonal questions or concerns feel free to reach out to me.
Best regards