I cannot recommend Martina highly enough! She is cheerful, friendly, intelligent, and very helpful! Here are a few concrete examples of how she went above and beyond to help make our time in Buenos Aires as a family with small kids easier.
When I asked for recommendations for airport transportation, she offered to and the made a reservation for a private car service on our behalf! She also called a taxi to take us to the Buquebus terminal at the end of our stay.
She thought about specific things that would be good for kids (the huge bookstore at El Ateneo Grand Splendid was a great suggestion!) she left a precharged BA transport card in the apartment to help us avoid spending time on the details of travel.
She checked in with us to see if we needed anything.
The apartment itself was spotless and comfortable. The air conditioning and pool made a big difference in the hot and humid days and nights of January in Buenos Aires.