I can highly recommend Penelope's listing on the studio's charm and location alone (there are a ton of restaurants, grocery stores, and banks within short walking distance). In addition, Penelope and her family are incredibly warm and welcoming, and Penelope was very helpful during our visit to Mexico City! We had the fortune of staying not once but twice in Penelope's studio, as used Mexico City as a home base for our road trip through Mexico. Our plane was delayed and we arrived much later than expected- even so, Penelope promptly let us in and gave us a tour. Penelope was also quick to reply to all messages.
We stayed in the studio for both Christmas Eve AND New Year's Eve, and Penelope invited us to celebrate with her family (who live downstairs). They were all wonderful and we really appreciated her kindness.
The place itself has a great charm and beautiful light in the kitchen area. The patio access is also amazing and relaxing after a day walking around the city. The bedroom and bathroom (down a spiral staircase) feel private.
All in all, I definitely recommend Penelope's studio!