This apartment is located perfectly in St Germain. You are about a 15 minute walk to Notre Dame or the Louvre. The Luxembourg gardens and Saint Sulpice are two blocks away. There are lots of restaurants close by as well as a couple of grocery stores. The Odeon Metro station is 1-2 minutes away.
The apartment itself has a small but very functional kitchen. The living room is nice sized and provides a wonderful rooftop view of surrounding buildings. There is a nice sized bedroom right off the living room. It has single sleeping bed. The main bedroom is upstairs so there is some separation possible after spending the day together. All of the pictures posted are quite accurate.
You do have to walk up to the fifth floor for this apartment. This might not be ideal for everyone, but was never an issue for us. Our host Mary was very up front on this subject so no surprises. If you have heavy luggage be prepared to carry them as there is no elevator. We loved being on the top floor so it was completely worth it for us.
Mary's communication prior, during and after our trip was excellent. She met us at the apartment at our desired time, walked us through the apartment and answered all of our questions.
Regarding getting around, we had 3 people in our group and Uber ended up being the same price or less than the combined total for all of us to ride the metro and you get door to door service.
We highly recommend this apartment and also Mary as a host.