Alicia was already waiting for us when we arrived. She explained everything and handed over the key, saying that check out time was very flexible. Great, because we were about to have a long night out! The flat has a lot of space for 2 people and was very clean. It is on ground level, but the street is a pedestrian street, so not noisy at all.
My only recommendation would be to have a small portable heater in the flat - we were there on a very cold, windy night and the lounge/living area was very cold.
Apart from that, great place, good location - only 8 minutes walk to Plaza Merced.