We stayed at Valerie and Alex's place for a week over New Year's eve and it was a great experience!
Valerie was very responsive and provided advices on activities and places to eat.
The flat is a gem with the roof top terrasse, and a few minutes walk to Copacabana!
Access to the flat is very secure, and once inside, it is a quiet heaven in the middle of a busy and bustling area!
Location is great as you are a block away from Copabacana, but also walking distance to Ipanema beach.
Impossible not to strongly recommend it!