This is a wonderful flat to stay in while visiting Lisbon. It truly is a perfectly remodeled top floor unit. When we arrived it was cool enough to open the windows at night and allow the breeze to flow through the apartment. A/C is not necessary during our travels, but if this is an must for you, the apartment looked to be outfitted with radiant heating only (I didn't see any HVAC vents or standard wall units). You can immediately tell the building is historic but well updated. It is sans lift, so if you have any health issues that prevent stair climbing this may not be your place...that being said, Lisbon is the city of 7 hills and you should be prepared to walk and climb almost anywhere you travel. The views from the apartment are AMAZING and the location is impeccable. It is right next to the 1st century AD Roman Theatre Ruins alive with history and overlooks the Castle of São Jorge. An easy 5min walk to Praça do Comércio (great for a taxi, food, tuk-tuk--100% best way to see the city), 15 min walk to Rosario Square (a great shopping area) and a 20-25min walk to Barrio Alto (alive at night with locals and tourist dancing and drinking). Without knowledge we arrived during the Dia de Santo António festival and enjoyed the night singing and dancing with the locals out in the street. Everything about our experience from airport arrival with an arranged driver, check-in to check-out was great. Thank you for allowing us to experience your flat and city. We will most certainly return in the future!