Alejandro is a saint of a man, who will give you a warm welcome and great conversation if you're lucky. Not only a host, Alejandro has designed the space himself, overhauling it from when he used to live in it himself as a kid. His space will let you visit CDMX while living in a building that gives off all the love him and other travelers have put into it over many years.
If you want to be in the middle of things, the location is perfect. You can walk in any direction for at least 10 minutes before finding a sleepy part of town. Parque Mexico and the heart of Calle Tamulpais are both only two blocks away on either side, and one my favorite gyms I've ever visited is basically at your doorstep (open 24 hours and only $1,200 for a month pass). Also, being on a side street, the city noise at night is easy to block out.
As for the home, the pictures are accurate. The bathroom is lovely, the kitchen is well-stocked (not much of a dining area, but you should be eating out anyway) and the bed was excellent. If you're working from home, the internet is a reliable 15-30MB depending on where you're sitting, though there isn't much of a desk area aside from a small table in the kitchen. Also keep in mind that although this unit is a full home in itself, you're essentially sharing a two-story home with a common staircase/foyer with a few other guests in other rooms. It doesn't feel crowded and it's not a hostel, but you'll hear each other come and go.
I thought it was nice, and was glad to have some wonderful neighbors.