First things first. This apartment is in a fantastic location. A few steps from Boissiere Metro station, equidistant from 3 Monop' grocery stores, just down the road from the Arc de Triomphe and a little farther from the Eiffel Tower. It is also easily accessible from Gare du Nord if you are coming in on the Eurostar or Thalys, as well as CDG and Orly airports. Taxis to the airports are also not very expensive if you have luggage and don't want to tackle the metro. There are also some very enjoyable cafes and restaurants all around, and we particularly enjoyed Cafe Belloy on the next street corner.
As long as you arrive with realistic expectations, your experience with the apartment will be fine. The check in was nice and easy, as there is a lock box on the door and you receive all of the instructions from David in advance. No need to schedule your arrival with the host to let you in. The interior door, which requires a key fob, did seem to get stuck and so everyone seemed to leave it slightly ajar for that reason. The apartment itself is quite small. The living area has the double sofa bed, and a single bed, with the second single bed being in the hall way. As other reviewers have noted, the decor and finish is a little more tired looking than the pictures suggest. Also of note - this apartment is on the ground floor. There is no air conditioning, so on hot days you'll want to open the back window into the courtyard and the front window onto the street to let the air flow. This can make it noisy however from all the passing pedestrian and motorized traffic. The kitchen is rudimentary with two hot plates, a small fridge with top freezer, and basic amenities. The washer/dryer was a welcome addition. The bathroom door was a noisy accordion door that was showing its age, but other than that the bathroom functioned well. We were a family of 4 with two adults and two young teenage children and it generally suited our needs and space requirements. The location for the price is the best feature though - just set your expectations appropriately and you'll have a good visit.