This apartment was clean, light and airy with windows that opened to the courtyard below. The bed was comfortable but firm (futon like), and the kitchen and bath were clean and functional (although the controls on micro/convection oven and washer/dryer remain a mystery for the most part). We only cooked breakfast eggs, and otherwise ate at restaurants or brought in cooked dishes from the great market street below.
Cigarette smoke from neighbouring apartments, courtyard was somewhat an issue, but hey, it's Paris!
For older folks the climb up three flights of narrow stairwell with heavy luggage might be an issue, as we were asked to lift bags in order not to bump them on the stairs (understandably, to avoid annoying neighbours with the noise).
Galenya was most helpful, and there were lots of info, maps etc. available at the apartment to consult re exploring Paris. Also, the metro was easy to navigate, and located nearby.
Helpful tip: Bus 30 runs from the Tocadero (across from the Eiffel tower and a nice view of same), circles the Arc de Triomphe, stops at Rue de Levis, and also stops near Sacre Couer in Montmartre (and the reverse of this of course).