Overall the apartment is very nice and is a great experience. Some details:
Location: Super. Just a few feet from a Metro stop (but you couldnt hear it), easily 10 good restaurants and 4 yummy bakeries within a 4 minute walk, 5-6min walk to a Carrefour grocery store, scenic views from the apartment windows, 10min walk uphill to Sacre Cour which is beautiful itself and has fabulous views (although touristy), nice apartment building with secure entrance and elevator to the 5th floor (or funky spiral wooden stairway)
Cleanliness: spotless.
Comfort: Modern and overall quite good. The queen bed was very comfortable. We slept great. Chairs/sofa/dining table were comfy. Considerable street noise if windows are open, but basically no street noise if closed. If the day is warm (>70deg) then you'll need to open the windows in evening for 2-3 hours to cool the place off. No problem for temps up to 80deg. But if it was a hotter day, you may need to leave the windows open longer. The kitchen is very small and a tight space but functional for coffee/tea/basic food prep, though probably not big enough for doing a lot of cooking. The bathroom was bright and clean and fully functional, though the shower does take a bit of effort to close the shower doors all the way when using and afterwards to keep the doors open to air out. Plenty of electrical wall plugs to charge devices.