Márcia is a great host and everything relating to communication and check-in was smooth. The one-room apartment is cosy and it has what you need for a short stay. I stayed there for a week, and it was perfect for me. The apartment doesn't have a view, but it is very well situated and you'll probably find yourself on a nearby bar or at the beach, that is also nearby.
Everything is working, but the fridge is dripping a little bit of water and the shower also needs a soft touch to work. I guess the price reflects these small things. They were not an issue at all for me, but it's probably good to mention anyway.
Best value for money, I have seen in Leblon and I recommend.