Cesar's place was a delight. There were a few things that I will list below, but for the most part none of it took away from the amazing experience we had.
Not Baby Proof
We did not have any kids with us, but if you're considering this place and you have younger kids, I would extend some caution. The stair case from the third floor to the second and down to the bottom floor does not have any railing. There were a few times that we commented on how dangerous it was even for us (if someone was drunk or misstepped, there was literally a 20 foot fall all the way down to bottom floor).
Check In
I don't think it's requested in the listing, but we were required to send a photo of our ID in order to get into the building. Because this request came to us a little late, we were all, separately, in route to Mexico City by the time Cesar asked us to send. I was first to arrive, and although I sent my ID, I did have issues getting into the building. Luckily, Cesar was nearby and was able to come down and help get me in. Just something to keep in mind and maybe send sooner if you can. I'm sure my not speaking the language didn't help either.
Hot Tub
If you're from the states, it's probably not what you're use to. You'll have to manually fill it up and empty it for each use. Not a major issue, but you can imagine that it won't stay as hot as you're use to.
Water Temperature
Upstairs en suite room has it's own bathroom which was really nice. A major issue was trying to get the temperature right. We ended up just using the downstairs shower in the master because it was nearly impossible to get it in the middle of scolding hot and freezing cold.
Again, I know these are seemingly minor things, but good to know nonetheless in case it affects your decision. Having made these points, we would still stay here again. Cesar was a sweetheart of was responsive and helpful in every way he was able.