We stayed 4 nights in Nina's apartment. Is is a clean apartment, and the basics are well provided for cooking, coffee, bathroom, sleeping, dishwasher, ... A bit darker than in the photos of the ad, because the windows look out at a small courtyard surrounded by buildings. The appartment is small, but we got around with 2 adults and 2 kids (12 en 10 y). You get correct value for money.
Great location! We did almost everything by foot or bike (vélib). The Marais is also a nice neighbourhood when you want to be a away from 'extreme tourism' like in Montmartre.
We didn't meet Nina, but the correspondence in advance was clear and helpful. Boyeth was there to receive us.