As everyone probably already has mentioned, the location to this place is Amazing. It's exactly what we were looking for. The big green door you use to get into the flat is sandwiched between 2 busy restaurants. There's like 5 alleys all packed with food, bars, and various shops. The Saint Germain
Like most other apartments in Paris, there's no elevator, her place is in the 4th floor, so be aware of that. The apartment was very spacious, it accommodates I believe 4. 2 on the main bed, and 1 on the smaller bed upstairs, and I believe the couch pulled out. The host was very communicative and check in was a breeze. She had us meet her daughter between a specific time, and she walked us through how to enter the big green door, and how to enter the apartment. However, because we needed to meet at a specific time, that meant we had to cut our Disneyland trip short, and leave early to make the check in time. (Otherwise we would be charged 55 Euro checking in late)
The apartment itself is very nice, the living room area has it's own couch, and bar area where you can wind down and talk about your day before you're ready to crawl into bed that's located in the bedroom. This was our favorite apartment, and definitely the biggest and we stayed in 4 during our trip to Paris, and Belgium. The apartment was very clean, however there's a finite hot water supply, and we found out the cleaning lady had used it all. So we had to wait until the morning to take a hot shower. I took a cold shower, my wife waited until morning.
There train station Saint Mitchel of Notre Dame is there, which connects to all the major trains. There's a convenience store a few steps away that sells snacks, wine, toiletries or medicine. I definitely loved the place, if we ever come back to Paris, I will definitely stay here again, now looking back, I feel that Latin Quarter is in the center of everything. Thank you Nadia, your apartment was wonderful.