This is a unique and recommended option. The apartment itself is spacious (two floors) and tastefully furnished in a natural, minimalist style. It has large windows which provide an abundance of light. The upstairs bedroom looks out on a plant-filled patio where it's nice to sit in the sun. Guests have an entry key, but there is always a person at the front desk to let you in.
Santa Maria la Riberia is a beautiful quiet neighborhood with an abundance of good restaurants and bars in the Alameda Park/Morisco Kiosk area. Juan Pablo provided a nice guidebook with local tips. There are some nice old residential buildings in SMR. It's a great area for walking and seemed safe.
SMR is not within walking distance to the Historic Center of Mexico City. There are two metro stations that are within a 15-minute walk or you can take a Uber. The Historic Center is not far away on the Metro Blue line.
Juan Pablo was a responsive, accommodating host. It was an excellent experience and value.