Andres and his brother were more than welcoming us to Mexico City!
The great: The apartment itself is very spacious and perfect for a couple of people traveling. There is a large "living" space, kitchen, and bed area, plus a small balcony (and a gym downstairs). Also, there's 24/7 security, so we always enjoyed being welcomed into the building by security. We received a guide upon arrival pointing to the hosts' favorite places to eat/go-out/shop, and this was very nice and helpful.
The good: The apartment is fairly centrally located (only a few blocks to the metro), but a longer 15-20 minute walk to central Polanco. If you've never been to DF before, you'll see that Polanco is a good place to stay, as it's convenient to Condesa, Roma, and Centro, but itself is close to many parks and museums.
The could-be-better: The wifi could definitely be stronger. Also, we only had one key, so it was a little bit of a juggling act with getting into/out of the apartment. In addition, it's right along a fairly busy road, so there's a bit of street noise. But, this is likely to be an issue most places in Polanco.