Incredible. In every way. I've been travelling since January 2013 and I have to say that this is the best self-contained accommodation I have stayed in since then. The flat is very clean, modern and comfortable and if you stay for longer than a week, they send a cleaning person once a week to change your sheets, towels and clean the flat. It has everything you could possibly need in the kitchen, even a blender so I could make my vegetable juices in the morning!
The agency was very flexible with our needs and organised the cleaning around our schedule, answered all emails within a few hours and responded favourably to all our requests. The day before checkout, they called us to ask us if we wanted them to book a taxi for us to the airport and the prices were the same as a normal taxi would have cost us.
And I haven't even mentioned the view or location! The view from this flat is incredible and even more incredible is the view from the gym located on the 31st floor. The building also has sauna, jacuzzi and outdoor swimming pool. The day and night security staff are super efficient. The flat is in Palermo, just a few metro stops from some of the main sites of the microcentro and San Telmo. You are right in the middle here so it's easy to get around the city.
The only slight negative was the temperature control in the flat. It gets very hot from the sun and the flats have underfloor heating so if the flat above has their heating on, it will warm the flat up to roasting point. That said, there is an air conditioner to offset this and you can always open the windows and doors to get some air flowing through.
I was so sad to leave and if I go back to Buenos Aires, I will definitely be using this agency and hopefully I'll be staying in this flat.