What a great space! Jenny is a lovely host and very helpful and responsive. She gave us plenty of advice about how to get around and places to try. The apartment is in a great area. It's got a real grocery store, patisserie and fruit stand all within a block. A few blocks down, there is a busier area with more shops and restaurants (try Sanyo Sushi). We were far enough from the touristy area to feel like a native, but there are two metro stations within a few blocks (2 and 9) so it was simple getting around. If you want to stay in the heart of Paris though, this isn't it. It's about 35 minutes to get to the center of Paris.
The apartment itself is lovely. It is on the 5th floor (really 6th since you start at ground - 111 stairs total), no elevator. The view from the tiny balcony is about as French as you can get beautiful old building stretching out in both directions. If you're traveling during a season that sitting outside isn't going to be comfortable, then you may prefer something on a lower floor. We were there the first week in October and were able to keep the doors wide open most of the time (no screens or AC, FYI - but we didn't need them).
It is clearly a place that she lives in so there's not a lot of available storage space. dressers and closets are full. However because of that, there are plenty of dishes, pots and pans and the basics for living (plenty of towels). She was kind enough to provide us with a hair dryer, soap and an umbrella. She is very very nice and willing to help in any way she can.
There is one bed (queen) and a couch, but it doesn't open. The bed is very comfortable. The whole place has a nice vibe, quiet, airy and comfortable. We loved it.