When I arrived the toilet was not working, but they said they'd fix it after they got the part. That didn't happen until I asked the next day, and even then there was no test to see it was working. General tip: If the water does not naturally fill, pour a bucket into the tank; if the knob to flush is not taking, pull the chain up in the tank, and it will go.
Aside from inherited plumber role, the apartment was a great experience. You can walk to the centro very quickly; go grocery shopping easily; and try a multitude of coffee shops in any which direction. They have a filter if you care to try your hand at drinking the water. There is a router set up, so you won't have to chase a connection. And they have everything you would need to cook for yourself. Also the view of far off buildings and mountain range is beautiful from inside, but even better from your private terrace. You'll be lucky to stay here and truly reap the most of Coyoacan.