Mariana's apartment is perfect for 2 people looking to stay in one of BA's best neighborhoods. The location is great, very close to cafes and bars, grocery shops, clothes shops and there is also a decent gym just around the corner. You are also very close to transport links and the subway. If you like walking or jogging its easy enough to find an enjoyable route not far from the apartment (rose gardens or jardin bontanico).
Apartment is well stocked and has everything you need for a short or longer stay (months). We cooked most nights and enjoyed Mariana's great stock of juicers and coffee making equipment. There is also a nice ipod/iphone sound system and flat screen tv. The WiFi is ok not super fast but fine for most tasks. We did not really use but aircon works great.
The view from the balcony is amazing and you get great natural sunlight all day. The building overall is very secure and has a nice pool and green area on the ground level. Some people mentioned trouble with the lifts but we never found them a problem and you can always walk around to the 2nd set of lifts if you are left waiting too long.
Mariana is a fantastic host, quick to respond and answer any questions we had regarding the area or further travels. She was also very accommodating allowing us to check in during the middle of the night and just generally being a relaxed host.
There is a lot of construction in the Palermo area and there is a new apartment being built next to the block. We found the construction really noisy although we were there for the worst part of the construction phase (exterior structure) and we also spent a lot of time in the apartment, if you are out and about during the day then you may find it less of an annoyance.