We stayed at Gaspards apartment on our honeymoon in June 2015 and the place is amazing. It is very accurately described and the photos don't do justice to the place. A very modern and elegant apartment with all the right amenities. The apartment is also located in a bustling area close to 2 metro stations. Sacre Couer is just a 15 min walk away too. Gaspard too was very helpful and assisted us in everything. I would highly recommend this place to stay. It's very secure and would make your stay in Paris beautiful.
A small issue was the AC never worked.