In short, both Dircelia and her Ipanema flat are amazing! My colleague and I stayed at her place while visiting Rio after a conference in São Paulo. We had actually stayed in a hotel-owned suite in the same building as Dircelia's flat last year (and loved it), but this year was even better.
The apartment is more updated and homey than its hotel suite counterparts, and comes with even more amenities -- on top of the hotel's doormen, security, daily maid service, and location (1 block from the beach), the flat included some beach gear (mats and an umbrella), a bowl of fresh fruit, and a booklet filled with Dircelia's local tips and recommendations. (Every restaurant she listed was delicious!)
Most importantly, Dircelia herself was wonderful and exemplifies the best parts of the Airbnb experience. She was quick to respond to all of our questions leading up to the trip and was waiting for us before we arrived at the building to check-in. Then, when our flight home was canceled due to Hurricane Irma on our last day in the flat (which had more guests arriving later that day), Dircelia helped us look for a new place to stay. She really went above and beyond, staying in communication with us long after we checked out to make sure we got home safely. It was invaluable to know we had a local contact looking out for us during a stressful and uncertain situation.
The only downsides I can think of -- there was some street noise at night and construction noise during the day (but any apartment in that area would have the same issues).
All in all, a great flat and a great experience -- I recommend Dircelia's apartment to anyone visiting Rio!