My stay in Paris at Jr's apartments was absolutely enjoyable! The district where it's located seems to me quite authentic, atmospheric, full of life & aesthetics, and small distance to the subway station and Montmartre (within Montmartre cemetery) does also worth mentioning!
Regarding the apartment itself, in this flat, despite its modest size (which was totally enough for me as a single traveller though), I felt safe and cozy, slept well, and also enjoyed the authentic Parisian view from the window :) The only inconvenience for me was that the flat is on the top-level floor, which was a little bit tough to reach carrying a heavy bag. But by no means there's absolutely no host's fault here.
Thanks Jr for this opportunity to stay at your place! I'll definitely choose your place again next time, if it's possible, and recommend it to other solo travellers!