Austral Suites are great - well furnished and appointed, well serviced and with good Internet access.
I would thoroughly recommend them - my wife and I had a studio which well-suited our four night stay. The situation is good, with easy and quick access to the metro and supermarkets within a 10 minute walk. It's a business area, so is full of life during the day, but much quieter at night. We ate in the apartment each night as supplies were available close by.
Expedia need to put a warning on their website to say that there is no signage for Austral Apartments on the building (it seems AS aren't allowed to do this) and if arriving either after 17:30 or on a week-end or holiday, note that an envelope will be left with the reception staff, but only Spanish spoken.
Our driver from the airport had never heard of AS, but found the address on his satnav. He was also concerned not to leave us until he was sure we were in the right place.
AS's management could improve matters by putting apartment instructions in English as well as the comprehensive Spanish version and ensure that the information is up-to-date. The location of the office was shown as in 1403, but had actually moved to 908. The layout of the building makes it difficult to find the rooms as it's divided into two separate parts, each using different lifts.
Once you're over these hurdles, AS are to be thoroughly recommended. Pilar, in the office doesn't speak English, but took the trouble to phone a colleague.