A lot of positives: When I asked Yves if we could do a late checkout (we had an evening flight) he was responsive and very helpful. Also, the place is close to everything, which is a huge plus.
The apartment is above average, depending on your expectations. It's kind of dark and narrow and there's little air circulation. There's no elevator if that's important to you. Probably more suitable for young people than older folks. It looks better in the pictures than it actually is, but it's not bad, I'd call it adequate, serviceable.
On the negative side -- like others have mentioned, it does indeed stink in the hallway and stairs, unpleasant and off-putting (but no bad smell inside the apartment).