I understand this. To get my space, I tend to occupy whatever bedroom is not in use, or the one that is "opposite" of whoever is home. So, if Indigo is home, I go to Mr. A's room, and vice versa. This way, I find that there's a little more thought from everyone involved that I'm in a space they wouldn't normally walk into unannounced, so they remember that I'm having my time.
I know your family offered to put Mono up; perhaps you could use a break for a night or two with them instead?
Anyway, just thoughts, which are probably all rubbish because you can throw everything out when kids are involved, but you're all in my thoughts.