We stayed in Ernests apartment for 3 days with our family (5 persons) and enjoyed it very much.
The apartment is spacious and well equipped for a family stay.
It's located on the beginning of the Alfama area, so you don't have to carry your luggage through the tiny alleys of this area. You have to climb five stairs though, because the apartment is located on the fifth floor and there is no elevator. Ernest had been clear about this climb and it didn't bother us.
The rewards are perfect views, a spacious, clean and cosy apartment, the cooling wind during the night and the buzz of Alfama underneath you.
It is perfectly situated for a city trip and has plenty of restaurants, fado bars and grocery shops around it. Even if you don't visit them you may hear them during the evening. Fado can't be closer by.
We didn't meet Ernest but he was a good host. He communicated very proactively and clearly.