Frida's place is in an excellent location and she has a really convenient check in and check out process. My spanish isn't very good, but she and Mariana (who handled the check in and check out) were understanding and spoke slowly for my benefit.
The apartment is in a safe neighborhood and it's literally a 3 minute walk to the metro or the metrobus that can take you anywhere in the city. I will say it might be little loud if you're a light sleeper, but I slept through every night just fine.
Just a quick tip about the hot water for the shower, it's better if you use the flexible head instead of the permanent fixture.