Good value for the money.
Gherardo and his mother were outstandingly hospitable. They made every possible effort to make my stay comfortable and pleasant.
The location is nice. The apartment is located in a less touristy part of Florence, so it's not crowded, allows you to relax and enjoy your stay. I walked everywhere: European University Institute (Villa Salviati Campus) is within 15 minute walking distance, and the city center is about 45-60 minutes by feet.
Some practical tips. The place is, as described, very basic. Bring with yourself whatever you may need: soap, shampoo, laundry detergent, hair dryer, internet, etc. Gherardo was able to find an iron for me upon request, but I recommend asking him about things like this in advance. I would also recommend bringing some insect repellent (the apartment is by the river bank, hence mosquitos in summer) and earplugs (during my stay, the neighbors were really noisy till 12 - 1 am, and without my earplugs I wouldn't be able to sleep). I also wouldn't recommend ordering a delivery to this apartment. My parcel got lost. All of these are just practical considerations to make your stay more comfortable and in no way a criticism. The place and the hosts are both great. If I came to Florence again, I would love to stay there again!