I sayed there as the rooms are in the same building as La Sebastiana Apart Hotel, which is a very recommendable place to stay.
In the Aconcagua apart hotel the only good thing is the location. Lots of restaurants nearby, easy access to the subway. All the rest was horrible: old, ugly furniture. dirty, cheap looking aspect. leaking water in the bathroom. Internet and telephone did not work and was not repaired, tv from last century, small beds. In the same building you find La Sebastiana Apart Hotel. The rooms there are a world of a difference.