We stayed at the Argentina Hotel in March for 3 days - two rooms for a family of four. My parent's room was updated and remodeled, but the room my sister and I stayed in was not. It was a very simple, no frills room. It was clean, but the towels were terrible - paper thin and one day when I opened my towel, there was a huge whole in the middle.
Our room was on the street and was very noisy. Also, even though there was a door at the end of the hallway before entering the breakfast room, it was extremely noisy early in the morning from the people getting breakfast. Speaking of the breakfast - it was not very good. They did not even serve fresh coffee - it came from a machine.
The staff was friendly. The location was good if you want to take a metro to the center. You can walk to the center also, but you might as well find a hotel in the center if you want to do that. We stayed at this hotel because it was close to the train station and to a metro stop, so it served that purpose for us.
In summary, the hotel was average. It was clean and inexpensive. If you are traveling on a budget, it is not a terrible place to stay, but don't expect much.