Alessandro is a very good host. He is very organized, anticiped our arrival, the need of our trip to give good advises and helped us on ouf come back (lugagges drop, taxi etc).
The flat is very clean, the beds are comfortable and the service is as a hotel. The only thing not very comfortable for us is the bathroom. Bathroom and WC are combined so if you are 6 like us, sometime it can be long to have access to the bathroom. Besides, the hotwater didn’t work very well for us, the water force is quite weak and sometime it lost for some minutes. So if you don’t mind cold water, it is ok.
About the location, it is very close to Vatican, you can walk. For the center (Trevi fountain for example) you need to take a bus as it is about 40-50’ of walk.