Ana Paula's apartment is located brilliantly, esp for the world cup (right opposite the metro that takes you to maracana) and a few blocks from the fan fest on copacabana beach. There is a supermarket next door and plenty of buses/taxis nearby.
The room was as described and its actually a part of a 2 bedroom and 1 bathroom flat- ana paula's family lives next door which i found to be rather handy. Ana Paula was super responsive and lovely, as was her husband. They also provide a light breakfast and coffee in their living room which is really quite handy.
The only thing i would note is that if there are people staying in the other bedroom (as was the case during our stay), the bathroom access can be a bit annoying if everyone is on the same schedule. Else, for those looking for a central location, a nice sized air conditioned room with lovely lovely hosts, i would really recommend ana paula's place.