Great location! Don't be afraid to have a favela in your back; I feel the area pretty safe (two blocks from beach) the subway is pretty close (10 minute walk), the avenue has a lot of traffic and taxi availability (I always use Uber), a Pão de Açúcar supermaket next door, some eateries pretty close.
As usual, but that applies to all Rio locations, exercise common sense and don't display expensive items and keep always an eye on your stuff.
Regarding the apartment, it is small but should it has a great big main bed (more than enough for two persons), a bed next to the front door, and a sofa bed (we never use it). The apartment has the basic amenities, heated water, A/C (we barely use it as Rio's temperature was somehow chill), bedding, etc. Great acoustic windows that cancel most of the noise from the favela in the night; seems those guys love parties most of the nights! Decent curtains to block the light when you need to sleep. The sun came only from the windows on the main bedroom, so the area next to the second bed may be a little more dimmed and not so lit as main bedroom. Not a problem for us at all.
There is doorman security 24/7 but, contrary to other buildings in Rio, not bothering at all. Apartment is on a high floor so, after midnight, you have to use service elevator. Understandable to save energy. Not problem at all with entrance/exit.
Nikolas, the guy is charge or the appartment, very kind and willing to help you. He's an American dude, so you don't have trouble is Portuguese is not your first language option.
Considering the options in the area, and the competitive price of this place, I would return again if I want to stay in the middle of Copacabana and Ipanema areas. You have a very good return for what you paid. It is not the JW Marriott in terms of amenities, but you do not pay that fares! Great stay for us!