A relative has a lovely apartment in Carcassonne. It's a bit old and battered in places but has great character, like high ceilings and french (of course) windows. Lovely balcony too. She said it cost E60k. That was 8 years ago now. There are ongoing costs like our own council tax and so on. Not sure how much that is, I think it depends on the rate struck by the Town Hall or something, and location.
The best part of the location is the ease of access from Carcassonne airport to the city - a fiver on the bus, well last time I was there anyway. Then you can then take the train to Toulouse, or Narbonne and places in between, and down to Limoux (wine country yay!), and Quillan in the foothills of the Pyrenees. No car required unless you feel you want one. All facilities available within ten minutes, like supermarkets, train station, buses etc. Nice spot.
I've been a few times and never felt the need to have a car at all. YET!
Relative does not let it out, it is for family only. Best solution all round. Not much to be made otherwise and lots of hassle. I love my lovely relative!
I'm toying with the idea of buying a tiny place in France myself, but not absolutely sure yet. It would have to have good transport links though, as I am not confident driving on the left. Sorry but that's the truth, I may as well be honest about it.