Wow, what a great location. A lot of great Paris landmarks [Louvre, Musee D'Orsay, Notre Dame to name a few] are within a few minutes of this location either by foot or if you're a little more daring, by e-bike. The Saint Germain area is full of great cafes and shops again all within walking distance.
For the little flat itself, its more than adequate, comfy and cozy, and its quiet [away from the street noise below]. It has plenty of space for a couple to stretch out a bit [Annie's description and pictures are accurate]. Two items to consider: 1. It is on the 4th floor so to come and go you have to go up and down 4 flights of stairs. But no need to carry your heavy luggage up/down the stairs, Annie will bring them up/down on a lift] 2. The shower is tight, at the the section of shower that has the shower head. But, I'm 6'1" and made it work.
Annie is a great host as well. One thing I appreciated was that she has everything labeled like how to use the washer/dryer combo, which I needed to do some laundry coming from another location. She's very knowledgeable of the area as well and gave some suggestions on a couple of cafes to check out.
Definitely recommend, you won't be sorry, just book it!