Our stay at Al and Jackie's apartment had a lot of positives and a couple of negatives. We arrived around 1 or 2 am and Angel was there to greet us and give us the keys and wifi password. I liked having a key card to get in and out of the front door and a separate key to the apartment - it felt very secure. Angel was very nice, but I speak limited Spanish so our interaction was limited.
The apartment itself is great. Little kitchen, some snacks, waters, and cokes which was a very nice touch. The tv was huge, so that was cool, and the bed was comfortable. The furniture is a little worn but nothing egregious. The binder of suggestions was helpful and we found a few things to eat and do in there.
The neighborhood was perfect. We couldn't have asked for a better location. 3 blocks from the zocalo, lots of shopping and dining in the area, and right near the metro.
The negatives: I can sleep through street noise, but there was a weird siren sound going off about every hour all night the first night we were there. It didn't happen on Saturday night though, so maybe that was an anomaly. Also, the elevator was broken and climbing 5 stories multiple times a day isn't that fun. I'm sure it will be fixed soon though, as it was working when we first got there and Al apologized for it later.
Overall, I would stay here again and I think Al and Jackie are great hosts. They communicate and stay in touch without being intrusive or overbearing. The neighborhood, price, and apartment itself outweigh any negatives.