This was our second time in Caroline's place and we had a perfect stay. The apartment is very nice and large enough. It is also quiet at night, we didn't hear a sound. Although we didn't meet Caroline in person, check-in was perfectly arranged and communication went smoothly.
The neighbourhood is very pleasant, right down the apartment building is a pedestrian zone where you can find a lot of shops for your everyday needs. The nearest metro is 5 minutes away and brings you to the Opéra and the Marais. Bus line 30 takes you right to the Eiffel tower. We would return there without any doubts.