Great location - my wife and I stayed five nights. The flat / apartment is directly above Sonia (restaurant) and next to Niddo (brunch spot). The decor was nice and sufficient. Good balcony for a relaxing coffee or meal. We were able to get around very easily from here. We walked everywhere and there are so many walkable spots (Chapultepec Castle, Four Seasons, the new Ritz, Handshake Bar, etc).
Now the downsides. The apartment will smell like a restaurant for most of the day. The smell and ventilation from Sonia seems to pipe through the flat. Some of the clothes we hung out on the hanger smelled like we sat in a restaurant. One day we were coughing in the flat as it seemed the restaurant was roasting a batch of chiles.
Overall we would stay again. The value and location is just superb.