We stayed at Lorenzo's place for two nights in June. Honestly, it was one of the best places we have ever stayed in (and we travel a lot). It was spotless clean, exactly as seen on the photographs and the location is amazing, right above a very lively square with lots of cafes and restaurants but also not extremely tourist-y. There's people going by and a street market every morning. And if that scares you, thinking that it will be noisy, relax - the apartment is on a high floor with beautiful surroundings and any noise there might have been never reached us. Also, it is located on the residential side of Florence but still a few-minute walk from the all sight-seeing spots.
The apartment itself is beautifully made, every detail is cared for, there is nothing you might miss from your own home. Everything is so clean that you immediately feel comfortable. We are those picky people who bring their own towels, sheets and glasses to airbnbs, but felt we didn't have to in Lorenzo's apartment. And, if he'll have us again, I think we might save space in our luggage by not bringing anything.
Lorenzo was very helpful while making arrangements, he offered advice and information as requested, he was on time waiting for us at the apartment, kind and with a smile, and I am confident that, had we needed anything, he would have met our needs immediately - a very good host indeed.
All in all, the place is highly recommended.