I used to live in Polanco, and this apartment really captures a lot of the charm of this part of Polanco - cozy, VERY SPACIOUS bathroom and kitchen, great decor, and on Av. Horacio with its tree-lined walking path. The Polanco subway station is also very close by. El Farolito is also right downstairs, which means great tacos at your fingertips.
While apartments in Roma / Condesa are large but have weird layouts / aging bathrooms / noisy/ are somewhat cold and damp, this cozy apartment really doesn't have any of those problems. From the decor alone, it could be an apartment on the nicest street in Paris.
You can tell the host used to live in this apartment, and that they care a lot about it - everything from the decor to the sheets and towels are top notch and the kind of stuff you'd have for yourself in your own home. This is one of the best Airbnb I've had in Mexico City.
Check in is very easy (and high-tech), and the hosts are super quick to respond. If you're searching for a place in Polanco rather than Roma, this is a great choice.