As others have noted, Bairro Alto is at the top of a hill, and this unit is on the fourth floor without a lift. This is all in the unit's description, but it's easy to gloss over something like that. So, get ready for some exercise! That being said, you'll probably be climbing that hill anyways to visit Bairro Alto. The views are worth it on their own, and there are a variety of nearby restaurants, bars, etc.
Dulce was a great host and welcomed us along with our dog for several weeks. The unit was cleaned prior to our arrival and stocked with the essentials.
We visited in December with lots of rain and temperatures around 16 degrees Celsius. The space heater did help at night, but it was only really good for one room. There was some minor issues with rain coming into the unit, but the host sent someone out to take care of it. I would recommend this unit as being best in spring or fall when it is warmer and dryer