What does “Only 1 left” tell me?

By itself, “Only 1 left” tells you the page is showing a limited-availability message. It doesn't tell you one what. MazeVue has not verified a live count here.

One what?

Read the words beside the message and the offer it accompanies. Is the count about this room type, these dates, this price, or availability on this site? The details shown may narrow the claim; they do not establish the hotel’s total availability.

What happens next—another booking, a different price, or availability elsewhere—is not established by those three words. Read what the message actually counts, then decide for yourself.

Source note: The UK Competition and Markets Authority’s accommodation-booking guidance distinguishes room, site and offer-price availability claims. This UK guidance does not verify any live provider message.