We stayed in La Posta Apart on our first trip to Ushuaia. This apart hotel offering apartments instead of hotel rooms. As a family, we found it to be much easier to have a whole home to spread out in with a kitchen and separate bedroom for the baby. Larger families will love this as our huge apartment could have slept 8. Smaller apartments are available as well for 2-4 adults.
La Posta was very comfortable and I would easily choose to stay here again. It's right by the airport and a bit far from downtown but with our rental car we had no problems. When we needed a taxi they arrived within just a few minutes of being called and were very cheap.