A friend and I stayed at Carlotta's apartment for 3 nights and we had the best experience! Communication with Carlotta worked perfectly, she answered within minutes, was really helpful with everything and had some really good tips for us. Also very friendly and professional!
The apartment was exactly as pictured. Clean, spacious with nice views of the river and the streets down below. It's on the 4th floor with an elevator so you won't have any problems with heavy suitcases.
The apartment is located in a lovely neighborhood with some cafés, restaurants, winebars and a supermarket nearby. You can pretty much walk everywhere from there or take tram 28 if it's not packed with other tourists ;)
I will definitely recommend this apartment to my friends if they ever decide to visit Lisbon!