Temporary rent in Buenos Aires

Hi! I want to spend one month in Buenos Aires and the last time that I was there I had a really bad experience renting an apartment by Araoz propiedades. I wanted to rent through realtor because I thougth that it was better, but this real estate agency: Araoz propiedades are not serious. They almost faked me, they took more Money that they say in Internet and the apartment did not have all the services tey said. Now I want to go to Buenos Aires again and I need help, I dont want a second bad experience. Could someone recomend me a good real estate agency please? Thanks : )