Ernie's space is nice and quiet. A mix of older and newer well organized furniture.
Very well located, almost in front of Plaza universidad, Cinepolis...
Small balcony where he was nice enough to let me smoke. Sun comes in in the morning but doesn't make the balcony too hot but warm. Although he has a very nice desk and office chair I got an extension cord and plugged my laptop to reach the balcony (to be able to smoke while using my laptop :)), and it was great!
I happened to be at his place during the December 11th earthquake 6.0, I heard the alarm very clearly, which is important because gives you about 40 seconds to get out or prepare. The place is on the 5th floor, you're not supposed to use any elevator at those moments, neither the stairs if you're upper 4th floor or so (unless you go upstairs in a small building), just get under a table or under some door frame, I chose the door frame and it was perfectly fine, it did feel safe.
I would definitely stay there again!