Guido was very prompt and helpful with communication. He was very accommodating and offered a place to leave our bags before check in (he lives right next door). He also made us a dinner reservation at his favorite trattoria that we were excited about but couldn't go because we were traveling with our one year old baby and baby had to go to bed earlier than the restaurant even opened :)
The apartment itself is amazing, absolutely perfect for what we wanted - walkable from the train station, and very walkable to everything else. It's kind of mid way between the Boboli gardens and the Duomo. Very spacious bedroom with amazing blackout shutters that had our baby sleeping in past 8am! Kitchen is small but has everything you need, even a washer to do laundry. Warning: Guido very kindly provided laundry soap, and it worked great for us. However, if you are sensitive to perfumes, bring your own unscented detergent - it smells good but very strong. There were other thoughtful touches to the apartment - a helpful folder containing information about where everything was including the nearest supermarket, a spare universal power adaptor, etc.
All in all, we had an amazing time and would definitely stay here again!!!