First and foremost, you must know, the photos of Delphine's apartment do not do the apartment justice! Perhaps the most accurate photo is the lovely patio photo -- in which you will certainly never get over. The patio was the highlight of our stay, for sure. You have a clear, uninterrupted view of Sacre Coeur, tea lights for nightfall, and plants everywhere!
I'd say Delphine's place is perfect for a well-traveled solo traveler but also a couple! If traveling with a friend, however, I am unsure if it would be as comfortable.
Another thing to note, for fellow American travelers, is that the listing says the apartment is on the 5th floor, BUT, by U.S. standards, it would technically be the 8th floor. Keep in mind as well, esp. if you're booking in the summer, there is no A/C and no elevator. After a long day of traveling, you may or may not want to make this trek, but I just wanted to ensure you knew.
My partner and I felt SAFE in this apartment and the area.
The best part of our stay here was the lovely 20 min. walk to Montmarte, which is easily one of my favorite Paris arrondisments.
We loved it here and found it just right for two people who plan to be gone, out and about, adventuring most of the time!