We have stayed at IpanemaPenthouse for 4 nights, and we a group of 5 friends travelling around Brasil.
In general we did like our stay a lot. Mostly because of excellent location of the apartment. It's just a few steps from the beautiful Ipanema beach and all surround area is very safe and close to most of Rio attractions !! The terrace was a very nice place to spend evening time, the only disappointment was that outdoor sound-system wasn't working.. ((
Breakfast served every morning was also a great advantage! It was served in a precise time every morning by a very nice host and was really delicious.
Overall - I would recommend this apartment for your stay at Ipanema.