The bedroom in our house which is just at the top of the stairs has a smell which comes and goes. The smell is also at the top of the stairs, just outside the bedroom. It doesn't really smell like something died under the floorboards, it's mustier than that. It's not gas, we had a gas engineer out to check. I've asked everyone from a furniture restorer we had round for something else, to various plumbers, builders and our cleaner if they recognise the smell and no one does.
It seems to come and go a bit, and wasn't there over the summer, it's just developed. There doesn't seem to be any damp in there, no dog-related incidents on the carpet and nothing I can see which might be responsible...
Anyone got any ideas?! I know it's a strange question but we need to get the sofabed and desk in there soon and I'd rather get to the bottom of it before we move heavy, awkward furniture in!