We stayed at Alex's place for 5 days in October 2016. This is my 6th trip to Paris, and my fiance's 1st.
The location is very convenient to the metro and the RER train that goes to the airport. It is a 10-12min walk to the Louvre and the Tulleries. 7e, where the Eiffel is, is a 20min bus ride that is accessible a few blocks away. Ile de Cite and Notre Dame is a 15min walk from the apartment. The area is a lively one with many options for dining, and late night socializing. There is a pharmacy and a small market nearby for all normal necessities.
The apartment itself was perfect for us, a couple in our mid 30's from the US. It is a small but well laid out apartment. The bathroom is modern and the water pressure for the shower was good. Very clean. One caveat is that it is on the 4th floor (actually more like 4.5 floors), for us Americans who like to count the ground floor as the "first" floor. It wasn't a big deal for us -- a little exercise to work off all the rich meals we had -- but take that into consideration if you have heart or lung issues.
Alex was the best host! Beyond accommodating and helpful! Not a single complaint!
Thanks, Alex, for a great stay!