We had a great time in Marcos' place. Great location in Palermo, walking distance to lots of shops and restaurants. There is also a small supermarket across the street.
Marcos was very helpful and gave us great recommendations on places to go for dinner and drinks.
The apartment is clean and description on the site is accurate. Lots of light coming in through the big windows in the morning.
However we had some issues during our stay with the appliances mainly. Hair dryer wasn't working properly, and the aircon started leaking on our last day. The pans and kitchen appliances are overused and should be replaced. Some door knobs and taps weren't fixed properly. We notified Marcos who assured it would be taken care of.
Overall this is a great place to stay, apparently dedicated to short term rental. We can only recommend it for your stay in BA.