TL;DR: Great host, apartment is as described; conveniently located.
If you haven't been to Mexico City before, then you'll be lucky to stay here.
May (the host) is the best you could ask for. She was extremely helpful when I asked for local recommendations, and she was very attentive and responsive when I locked myself outside the apartment. Most importantly for me, she spoke perfectly fluent English!
The apartment itself is just as pictured. It has minimalist/modern furnishing and all the essentials you need. The one drawback (because nothing is perfect) is that the shower head pressure was weak. Outside of sleeping and getting ready for going out, I didn't spend much time in the apartment. But if you intend to stay in the apartment for a longer time during the day, I think you'll be comfortable.
The apartment is conveniently located near good food and nightlife. There is a nice cafe as soon as you step out of the apartment complex. Take a few more steps and you will find Mercado Roma ("MR"), which has a plethora of food options and the famous El Moro churros (try them and thank me later). The cafe and MR are great for a quick bite and you'll find local tourists here but there is so much more great authentic food within minutes of the apartment that you'll be doing yourself a disservice if you don't explore. The bar options in Roma/Condesa are several...some of the good ones are even walking distance from the apartment. And there's always a scooter (Lime/Bird/etc) in front of the apartment for you to hop in. Using Uber is easy and cheap.