Excellent host! The house, lovely and stylish, is in the middle of Bairro Alto in the city historical centre. There are no heaters in the house but this is a very common thing in Lisbon and despite the weather (11 - 15degrees) it was not cold. Didi provided a couple of electric heaters but we didn't need to use it. During the week and in this season the neighborhood is quite ..if you are planning to go in Summer be prepared to wear earplugs as the area gets very loud at night being crowded with the best bars and restaurants .
Didi was very welcoming and gave us a long list of best places to visit (from landmarks to restaurants, bars, shopping, markets) so long that we have definitely a good excuse to come back!
He also provided soap, shampoo, and all those amenities you would not expect.
The house has all necessary tools for a long stay including the washing machine and an espresso machine. Maybe the only missing thing is a proper wardrobe.
Lisbon is amazing, fascinating and romantic...a not-to-miss experience is Tram 28 and a walk through Alfama.
Generally safe, just pay attention to pickpockets when in Alfama.