We had a great time staying at Oliver's apartment! The location is perfect, we were able to walk everywhere in Palermo, which has the best restaurants and shopping in Buenos Aires. The area is also very safe and comfortable and the apartment itself is sunny and bright with a nice patio overlooking the street. Oliver was also very accommodating when the washing machine didn't work and had our laundry sent out for us free of charge. He also arranged transport to the airport for us, and had a cleaning service come in twice during our stay.
I would definitely recommend staying here in Palermo!