Our family stayed at Cristina's apartment for 6 weeks during the summer. We loved the location (just a block or 2 from the metro on a lively but not to hectic street), and the apartment served well as a base of operation and remote work place as well. There are tons of restaurants and shops nearby, super markets, etc., so day to day living is pretty easy to manage.
The apartment is as advertised - the living room being a bit bigger than expected, and the master bedroom a bit smaller (though perfectly fine). The fold out couch was actually quite comfortable as well, which we only discovered the last week we were there . Cristina was very responsive, and when questions came up, they were addressed quickly. As Cristina mentioned before we booked, the apartment is a walk up and on the 4th floor (its No. 2 but you go up to the 4th level), which was fine for us but could prove difficult for others.
We would definitely book with Cristina again and now our kids are demanding we get the same swing Cristina had setup in the living room!