I have stayed there for 2 nights.
The location is very convenient as the Ipanema beach is a block away and there are restaurants around. The area is safe.
At check-in, the staff was very kind and efficient. They were speaking both English and French, which is very helpful when you know 2 words of Portugues.
My room was indeed a studio, very clean with a comfortable bed, a large shower and a balcony.
The breakfast buffet is not huge and incredible, but overall good, with fresh fruits and a very good coffee.
I have asked many requests and the staff always responded efficiently and promptly.
The only negative point I found was a bit of noise overnight due to a bar nearby on Saturday night, but when you are jet-lagged and it is your first time in Rio, you really don't care about!
I hope I can come back.