The location of the studio is excellent -- walking distance to the Patriotismo Metro station, all the dining and drinking options of Condesa and the lovely Parque Mexico and Parque Espana. Condesa itself is a beautiful neighborhood.
The space is a studio, so it's small. As others have noted, the terrace is great, as is the glass wall to the balcony. As others have also noted, you have to walk through someone else's apartment to get to the stairway up to the studio, but Elena is very nice and it wasn't a problem. The apartment is very clean and modern. There's a filtered water faucet for those of us who need it in Mexico, as well as dishes, utensils and a few pots and pans for cooking.
But there were some issues. First, there was no soap or shampoo in the bathroom, and the water pressure in the bathroom sink was very weak -- although the shower pressure was fine. The bedroom has plenty of shelves for folded clothes but only two flimsy wire hangers to hang clothes! The bed is a full-size, not a queen, so it would be a tight fit for two people. It was fine for just me. The bedside lamp is actually a desk lamp and was useless for reading.
In the living area there is a small, somewhat worn-out loveseat, and that's it for seating unless you sit in one of the wooden kitchen chairs or open the terrace doors and use the chairs out there to extend the living space. There is a giant TV but no instructions on how to make it work. I never did figure it out. There is virtually no counter space in the kitchen area, so any food prep would have to be done on the small kitchen table and then cleared off before eating. There's a coffee maker but no filters. Fortunately, a previous guest left a few beers in the fridge.
It's a small, nice but basic space at a decent price, and in a great location.