Nai was very accommodating and communicative, the directions to the apartment from the Paris airport were impeccable.
The photos were a nice touch, especially for someone who isn't too familiar with the area.
Although check in wasn't until the afternoon, because my flight arrived early am, I was able to access the apt. After 11 to Drop off my bags and wash my face. That was a huge help. The location of the apartment is wonderful, right next to the Luxembourg garden, tons of alleyways of shopping and food. As well as a short walk to sites such as Notre dame.

My only concern would be the lighting as you enter the apartment complex, especially if you're a female traveling alone. There were times I returned after dark and the lobby and hallway were pitch black, the only saving grace was the flashlight app on my iPhone, so I was able to navigate up to the apartment.
Other than that, the apartment is as advertised, good for one or 2 people, great location, small bathroom, but no issues.
I would certainly recommend staying here, if you want to be in St. Germain and just need somewhere to sleep and leave your belongings, as it is reasonably priced and central to many things in Paris.
Nai was a gracious host and I would use a listing from him again.