The bedroom downstairs is definitely still a bedroom for me and very desirable for many.
I viewed what was listed as a 3 bed house recently, bathroom was downstairs, but whatever. The third box room upstairs had actually been turned into a shower room, with about 3 feet left over, which was being sold as a bedroom. It had a very small chest of drawers in it, but no way could you have even got a baby's cot in it, let alone a single bed. The estate agent phoned for feedback, and I politely said the house was lovely, but only 2 bed in reality and I wouldn't have even viewed it had I known this (the picture in the brochure was very deceptive). She very cheekily said "it's such a pity you couldn't make the room work for you" and hung up!
I'm more annoyed about very over dramatic, hyperbolic estate agent speech now. Viewed a house which had a "HEAVENLY EXTENSION" advertised on the board - very ordinary semi with an extra room downstairs, never in a million years could you use the word heavenly when describing it.
Local.agents write things on their social media such as:
"you better buy a bomb proof jacket as this property is going to blow you away 💣" Again, these are very bog standard 3 bed terraces, no one will be blown away by anything!