House smells

I moved into a duplex a couple of months ago. It’s an older place I imagine, beautiful hardwood floors, small. Apparently it sat empty for a year or so, but I am told the floors were refinished during its vacancy. Not recently, as there is no smell of finish. Anyway, there is a corner of the living room where I have a chair where I sit and watch TV. There is a distinct sweet/sour/pungent smell there that I don’t notice anywhere else in the room. I have NO idea what this could be. I have a dog, but he has good toilet habits. Could this be a possible pet smell? I’ve never had an indoor cat, so I don’t know what smells they could leave. I plan on talking to my next door neighbor to find out what pets the former tenants may have had.

Any ideas?

That doesn’t sound like animal-smell to me, more like decay smell. Perhaps organic material was used as insulation?

Urg, now that concerns me. I live in an area with a very high water table, though I am not actually on water. Does this mean anything more? The ground floor is newly painted, though the basement is iffy. Dry, no active mold, but intermittently damp.

not to gross you out too much, but i had a similar problem in my previous residence: smell that i could not identify, unpleasant but not overwhelmingly retch-worthy, no visible signs as to the source… turned out to be a rotting mouse carcass in the wall

The house I grew up in is 150 years old, so I am familiar with dead mice in the walls. It worries that it could be something organic. My landlord is NOT the most pro-active one in the world.