Pros:
Very nice host, who waited late upon arrival, and was flexible regarding departure (not to mention the bottle of wine :-)
Ideal location, in a nice part of town (narrow streets with lots of stairs, close to the castle), very quiet though close to the metro.
Everything was neat and clean. The bed (the matress) was good.

Cons:
In winter, the heating is difficult to tune (too hot or too cold) - but it is probably not needed very often in the year.
The flat (and especially the bathroom) is very small.

Summary:
The price is small, too, so it's good value for money.