Adriana's apartment is a great location to walk to the sights of the Center (we stayed in her place for two nights before heading down to Copacabana for three nights)--highly recommend walking to the Stairs of Selaron/Arcos de Lapa, the cathedral, the Portuguese library (and the area around it is full of little shops and street sellers), the National History Museum (and the old center on the way and along the water there), and the theater and national library in the main square. Not a lot of stuff happening after, say, 7 or 8pm--not sure if that was because of the military take over of the city or what, but we could find almost no places for dinner except for touristy joints right on the main square.
Adriana was there when we wanted to check in, and we let her know that the building number (117) hadn't been included in the address (luckily it was the only apt building on the block, so we found it eventually). The bed is okay, the AC works well, the shower is very powerful and we soaked the bathroom floor the first time we used it because it just blasted the shower curtain out of the way--so careful with that. It wasn't the most spotless place, some hair on the floor (enough for me to notice). Check out was difficult because she had to meet us at the apartment to get the keys, and she was stuck in traffic so we waited for 40 minutes for her--we told her to get a copy of the key so people could just leave the key on the table for checkout. I think we could have stayed in a budget hotel in the center for about $10 more a night, and it would have been a smoother experience, but Adriana was very nice and her apartment was acceptable.