We stayed at the apartment for a month while working remote had a great time. The upstairs is very comfortable to work from (and even work out) and gets fantastic light at all times. We never had any trouble with the WiFi or noisiness.
Condesa is a fantastic neighborhood with plenty of options close by (although it's worth noting that grocery stores are about a 10 minute walk - nothing crazy though). We got food delivered oftentimes when lazy, and there were plenty of places to eat - I recommend Nosferatu for incredible pizza and tequila/mezcal/beer.
We kept the windows open throughout the day and night as it can get a little hot in the apartment, but Sarali has a fan provided to cool down the apartment. Because it's Mexico, we had to dust down the apartment every couple of days :)
Overall a very lovely stay with a very easy to get in touch with host!!