I stayed at Martin's apartment with 2 other friends and it was a great fit for our trio. Martin was very responsive to any questions, particularly when we locked ourselves out of the safe - he came over the very next morning to help. The location was great, just around the corner from Don Julios (great steak restaurant) and walking distance to Plaza Serrano. The apartment also had maps of the city that were very helpful and a super friendly overnight doorman! One other thing that I personally really loved was the water pressure in the shower - not necessarily important to everyone, but definitely improved my experience. The keys to the apartment were tricky at first, but we got the hang of it quickly. Thank you Martin and we hope to return to Buenos Aires again!