My wife and I spent a week in Michael's apartment and loved every moment. The place is located in the heart of Paris, where everything is nearby and accessible.
The apartment isn't big, but surely sufficient for a couple.
The place is well heated, always has hot water (enough for a 20 minutes) shower, and even though we stayed there over winter, the apartment always felt cosy.
The apartment is on the fourth floor, without an elevator, so going up with the suitcases isn't fun, but other than that, everything was great