It was a fabulous journey and Elena's apartment could be the best in town, especially the spacy balcony, cosy bedrooms, and the splendid view of Duomo. What's more, the perfect location, 10min walk to almost any spots in town, 20min walk to the right bank, to the Piazza di Michelangelo.
I would strongly recommend you to stay at Elena's apartment if you travel with family. But there's still one thing you should consider, stairs in the building might be a little bit narrow and steep. It has no escalator and could make you inconvenient if you have large luggages.