Helena’s place was perfect for us - clean, stylish, comfortable and in a wonderful location with close views of the Estrela basilica (don’t worry, the bells don’t ring after about 8pm)!
Some close transport options - tram 28 and a couple of local buses run right outside (although these are often very crowded so easier to use the nearest metro, Rato, which is about 15 walk).
Helena was a great host, and left lots of thoughtful touches and info about the Lisbon and the area - we definitely recommend staying here.