We stayed at the Savoy Hotel in Buenos Aires for only one night. It is a beautiful art deco building beautifully restored. It is a little bit expensive but no so much more than other hotels in Buenos Aires and the Savoy is in the center of Buenos Aires City.
The hotel was built in 1910 and Einstein and Evita both stayed in this hotel during the 1930s.
We had a room with two double beds, a very large bathroom with a great shower but no bath. The kids enjoyed the showers too. The room was quite considering how central we are.
The breakfast was really good considering we were in Argentina, continental and there were even chia seeds for the cereal.