We would definitely stay here again. It was an outstanding value due to the wonderful location (so much shopping, transit and food options within easy walking distance). There were 3 of us, but 4 would be comfortable. Sofa bed and master were comfortable.
We felt safe walking day and night all around this area (and I mean within a several mile radius).
The apartment has large rooms with large windows, and was quiet. The kitchen and bathroom are functional and modern.
At first, we thought there were no kitchen utensils, but it was just that the modern drawer and pull were not visible. The kitchen was equipped for cooking, but we did not cook.
Be prepared to immediately purchase coffee and toilet paper. There was about an inch of toilet paper and only one coffee cartridge (single use). Store is only a block and a half away, though. We purchased breakfast breads and a few other things easily.
The hairdryer would not stay on and I had to purchase one. I offered to leave it and emailed the owner the receipt asking for a refund if the 25 euro, but she declined and indicated she would buy a replacement.
Do not miss Galleries Lafayette at Christmastime! Really, there are so many things to see and do nearby. We purchased 2 days on hop on hop off (15-20 min walk to nearest stop, but a nice walk) and got all over old Paris that way. Be sure to ride at night (bundle up if cool/cold and it is worth it to see the city this way)!
Though the lack of toilet paper and coffee upon arrival was inconvenient, the hair dryer was an unexpected expense and the apartment is not set up with many thoughtful touches, it is a very nice place to stay and I doubt you could do better than this place in this price range in Paris.
Bring/buy slippers with soles because the old wood floors could definitely splinter (nothing wrong with them, just old and not heavily varnished).
Book this place with confidence!