I just left after an 8 day stay for a Spanish immersion program and some fun with friends. This apartment is incredible: everything I might have needed is just steps away. Other reviews mentioned how well stocked it is, but it really has everything - including nice touches like Tupperware containers, extra trash bags, napkins, coffee, paper towels, etc etc.
The neighborhood is lively, which can translate into some street noise at night, but not anything more than you would expect from a busy city neighborhood. There are earplugs in every room, but I used a White Noise app on my phone and was fine.
The apartment has beautiful hardwood floors that can be a little bit creaky if you are up early and walking around while other people are sleeping. This is not a negative, just something to know. Bring slippers or socks as other reviewers have suggested.
Amazingly, they offered to do my laundry. There was no charge for this, but I tipped Ana and Lulu. Ana was incredibly responsive to questions I had right after checking in and then again later in the week. She is a gem.
This apartment is an incredible find in Polanco. I recommend it highly.