My friend and I had a really great stay!!! It is in a perfect location and because it feels like a proper apartment, we started to feel like locals after a while :) We also felt very safe as two female travelers.
The representative that we talked to was super responsive and attentive, and made us feel like true guests. The only unfortunate thing about our stay was that the place was not cleaned well before we arrived. However, once we told our representative, she quickly resolved the issue by having a cleaning service come out right away. She also offered us future cleaning if we wanted it.
I recommend Proyectos Hamilton-- especially if you are staying for a few days and want to really feel immersed in the area.