It was easy to get in touch with Guglielmo. He was very responsive prior to my visit and answered the phone right away. His place is very cute and has a lot of character. I did not actually believe it is possible to have everything in such a small space, but Guglielmo has EVERYTHING you need (say for maybe an Iron for clothes).....
The place is located on the 7th floor, 5 min. maximum walking distance away from Ponte Vecchio in Florence. The building has a lift, but you can only fit 1 person at a time in the lift. Otherwise the walk up the stairs is not too terrible. The view from the top fully compensates all the troubles for having to walk upstairs!

The apartment is very small but incredibly well lit. It has windows on both sides of the building and offers beautiful views on both sides.
I felt very comfortable at Guglielmo's place and as I mentioned before it has far more character and charm than most of the hotels I have stayed at. I would definitely recommend the place and would stay again based on the ease of communication, location and views!