Karin's apartment was a great place to stay for the week I was there. It's central to everything and it has great views. I found the bed to be surprisingly comfortable and the maid service was also a nice perk. I don't speak much Spanish, and the doormen don't speak any English, but they tried to be helpful so we were able to converse somewhat through our phones.
I was there by myself, but if my kids were with me, personally, I would've been very nervous as it is on the 18th floor and the railing isn't very high. Overall, it was a great place to stay.