My father and I had a great stay at Olivia's! Her place is very central without being on the north/tourist side of the Arno River. We were able to walk to the train station in 20 minutes to take day trips, and were able to easily take the tram to and from the airport (10 mins of walking). We were able to walk about 5-10 minutes to Santo Spirito where all the best restaurants seem to be.
The loft style of the apartment allowed us to have plenty of space. The balcony was great for drinking tea in the morning. It was SO clean and very quiet at night despite being right by the Ponte Vecchio. I met Lilith to pick up the keys-- he was so friendly and right on time to meet me. Olivia was a very quick responder to all questions I asked via the Airbnb app.
The ONLY thing I would note- the loft sleeping area does have a railing, but only on one side of the steep staircase, so I would be mindful of this if you are booking with small children. Otherwise, it's a wonderful place! Would absolutely stay here again.