Marcos is a great host. He has fluent English and was extremely friendly and helpful from first to last. He made a big effort to prepare the place for us - including generously leaving us a huge bowl of fruit on arrival. Those little things that are annoying to buy on a trip, like washing powder and coffee, were all provided.
The flat is big and spacious, with an attractive terrace overlooking the sea. It is located in a small compound of just 2-3 houses, with excellent security. Located between a huge rock and a cliff road, we felt very safe there. Best of all, Marcos lives upstairs, so whenever we had a question, he came to help immediately.
So, although it's slightly away from the tourist hotspots, it proved a good location for us. Leblon is also one of the best parts of town for eating out - and Marcos has lots of good tips on places to go.