Very very nice flat! It is fully equipped for a long stay, kitchen has everything you might need for cooking, great appliances and enough space to chop/prepare food. The living room couch is comfy, there is a big TV to watch netflix on and the terrace gives the flat plenty of light for the whole day. This also gets the flat nice and warm, something I appreciated in the winter. I appreciated having the desk to be able to comfortably do some work. Internet was also pretty stable and relatively fast so I never had issues with videocalls or work in general. The beds are nice, the shower pressure and water temperature are great and the Japanese bidet is a bonus! I had no issues with the flat, everything was in working order, either way Anya was always available to contact.
There is a 24h watchman, who will open the main door for you but if he is not there (or asleep) you can use the keycard to get in. The building is big, clean and safe. The neighbourhood is a bit noisy currently, as there are some works going on near the building, so sometimes the noise gets a bit high and you have to close the windows to be able to work.
As for the neighbourhood, there are a few small supermarkets nearby but they don't carry much fresh fruit/veg or meat, so for that you need to go a bit further away to the Mercado Hidalgo. You can also take the easy route and simply order groceries from Uber, which is what I did, which is pretty convenient.
It is only 2 blocks away from Metro Niños Heroes and 4 blocks from Metrobus Jardin Pushkin, which is a huge bonus as you can easily move around the city during the day. The neighbourhood itself is an "up-and-coming" neighbourhood so there isn't much to do in it but you can easily walk to Roma or Centro in 10/15 mins. I would not recommend walking around the neighbourhood at midnight as it doesn't feel that safe, better take an Uber to go to and from the house at night.
Finally, I recommend this flat to people who already know the city and and looking for a nice place to stay, be it for work or pleasure. I hope I'll be able to stay once again when I go back!