Dominique is a terrific host, and we had a great time staying in Montmartre, as much for her hospitality and local recommendations as for the neighborhood's charm and history. We'd love to go back and stay there again.
Visitors should know and accept that there are 4 full flights of winding stairs to get to the apartment, and that the shower is not a lot larger than the area one can stand in. The kitchen and bathroom are each compact (and adjacent to one another, if it matters in terms of people sharing an apartment needing more privacy/separation of functions), but well-designed to take advantage of limited space. There is also some noise from above and adjacent neighbors (both wall/floor-transmitted & voice sounds noticed), and nearly every night late, one or more of the apartments across the very narrow street were entertaining (but we were up or out late many of those nights, too, so it was just something to note for those seeking a more subdued retreat). But these are realities of historic European cities and their buildings, and if one needs more comfort or ease of access, there are different types of places to stay that have made those accommodations. Also note that Montmartre itself is a hill neighborhood, with numerous stairs and steep inclines, which will also be part of your workout, as well as the stairs inside the building.
The apartment has some very nice furnishings, the bed was comfortable, and Dominique has provided a notebook absolutely filled with recommendations for great experiences in both sightseeing and eating, and she made a careful assessment of what we wrote her in advance of our visit, and she tailored her recommendations to things she thought would specifically appeal to us; she couldn't have been more giving and thoughtful. And thankfully, her English is much better than our French, so communications were easy and helpful, too.
We were able to make it to a few of the places she recommended, but indeed each was much better than if we had just guessed our choices of restaurants, boulangeries, or bus/train routes. And she keeps up with her research of local activities and amenities...she even edited her own notebook recommendations as she was showing them to us, to improve our experience.
And don't forget to take that photo of the back of the Moulin Rouge, from outside your window, if you go! Merci beaucoups, Dominique, a bientot!