I stayed in Sara's apartment for a total of 4 nights.
This cozy, charming apartment is perfectly located to explore the Marais neighborhood, just a couple of minutes from beautiful Place des Vosges. The nearby Bastille metro station would connect you to all other parts of Paris. I'd say that this apartment - full of books and culture - has more authentic character than most of the IKEA-infused experiences I had in Paris.
The (very) small kitchen has everything you might need in case you insist to eat indoors. The bathroom is renovated. The efficient heating would be a nice welcome after a day of exploration in cold weather.

Sara was a wonderful host. Communication was very efficient before and during our stay. She greeted me in the apartment, showing me around the place, and left some wine and cookies! she made it clear she's available (through phone) during the stay for any issue that might come up. She left a list of recommended cafes & restaurants, where not too many tourists go, along with maps etc.

All in all, this apartment makes for a perfect choice for a single traveler or a couple wishing to explore Paris just like a local.