Amazing location. The apartment is in a wonderful lively spot in the Latin quarter near to lovely local cafes (café Lea was our favourite) restaurants bars butchers backers and markets. We spent a whole day just walking around the area. It's also really close to the pantheon and Luxembourg gardens.
It's really accessible to the rest of Paris by metro (which is just a short walk away) and bus (which is just across from the apartment). But you could spend a whole stay just in the area and Latin quarter.
Rosa is a lovely woman and it was very enjoyable to meet with her. She cleaned the room very well.
As for the apartment itself it's cozy but is more than you could need if you are packing light.