The guest remembered, and the eco stay
Preferences on the guest come back next stay; an eco stay skips the clean or keeps the linen, and the savings are counted.
Preferences live on the guest, not on the stay: pillow, blanket, fragrance, the cleaning time they like, no feathers, extra towels, the newspaper, the temperature, allergies, the minibar, the turndown time, the language, the bed set-up. Set them on the desk page's *Guests* tab (by room or by name) or from the phone; on check-in the hotel writes them onto the stay by itself — a flag on the room card the attendant reads (*prefs: no feathers · cleaning time after 16:00*) that lapses at check-out, the note on the day's visit, and a line on the story. Next stay, the same, without anyone repeating it.
Eco. At check-in or any time after, the guest may skip daily cleaning, keep the linen, keep the towels — any of the three. The room gets an *eco* flag (and *no service* when cleaning is skipped) until check-out; the morning's rules respect it above everything else: a skipped day gets no visit, an eco day gets the *Eco clean (linen kept)* visit. A guest who chose eco once is offered it again next stay. The Sustainability tile counts what was saved from the hotel's own numbers under *Settings* (litres per linen set and per towel set, kWh and chemical per skipped clean, the rupee cost of a stay-over clean) and the reward the hotel promised (*Settings → Eco reward*), recorded on the stay when given.