Lol, no help, indeed! 😂
If nobody has strong feelings, I rolled randomly and it came up with Yazeba’s study. Using 3 square mementos will unlock the relaxed chapter "The Remodeled Library" and let us put mementos in the other nooks. We could also unlock a new Guest now if we want or save the remaining square and circle mementos.
The guests available to unlock in the front desk are Bethsy (a spoiled white cat looking for a treasure supposedly hidden in the B&B), the Dabrowski Family (Lily, an exhausted young wizard-in-training, and her oblivious dad, Bill), the Ptisilith (a mysterious ancient floating stone), and Rowan and Zephyr Lyranthiel (a pair of dandy elven bards with foppish and cosmopolitan tastes)
The guests available to unlock in Yazeba’s study include Agate Aventurine (an ancient mountain troll and Yazeba’s one true friend), Mel Larkin (a nervous librarian who transforms into a confident female werewolf and back each time he or she completes their short Journey), and Silkwhisper (a former witch who made a deal with fairies and now exists as a colony of moths).
The guests available to unlock in the Supply Closet include Dr. Domizio (an elderly tinkerer who created Amelie) and Hiccup (a delicate clockwork dancer).