We haven't actually met Maribel during our stay, but she was very quick to respond to all our questions and the lady which greeted us when we arrived was very nice and helpful.
The apartment is big and well maintained. We shared it with another guest who stayed in the next room, but barely ever saw him.
It's located literally 10 minutes walk from the Constitution square, so it's perfect for roaming the old town on foot.
There is free street parking in the entire neighborhood, but it's usually very crowded.
We had luck finding a spot, twice. For those who don't, there's a public garage two minutes drive down the street.