Cristina's apartment is exactly as shown in the pictures. Spacious, very well located, with view on Colon street but the bedroom windows are on the back of the street so it is quiet at night.
We were 2 families, 4 adults and 3 kids. For us, it was perfect like this but I think you could fit anothere family (there are plenty of bedrooms but only 3 bathrooms)
The communication was extra easy, Cristina helped us with our luggage because we arrived at 12pm and the check-in was at 3pm. That meant a lot for us, it helped gaining some time to visit the Bioparc.
All in all, I definetly recommend this appartment. It's perfectly located and the price is very good.
P. S. The only improvement that I would recommend are some locks on the bathroom doors. Having the kids around, you never know who will surprise you (and when) ;)