The apartment is extremely well located, and for tourists like us, it was perfect as a starting point - many places are within walking distances, and you are also near a metro, and near the wonderful tram 28. But because it is so centrally located, on Friday and Saturday nights we had to close our windows to go to bed, because it was rather noisy down the street with the windows opened - though once you close the windows the sounds are greatly reduced and you can sleep well.
Helena is a great host, and very helpful. She was very flexible, and allowed us, on our check out day, to leave our bags in the apartment for a bit, and called a taxi for us. She is also very prompt in replying to questions, so no worries there on booking her apartment! You are in safe hands!