Just one word to describe Guglielmo and the flat: fantastic!!!
We arrived in the evening and even though it was quite late, Guglielmo took the time to show us everything in the flat. He even had some pasta, some sauce and a great wine for us and all the basics for a great breakfast were present as well (juice, coffee, jam, honey, milk, cornflakes, cacao, cheese, etc.).
The whole flat was very clean and tidy and had a nice feel of "home away from home" to it. It's equipped with aircon, a nice kitchen and two really nice bedrooms, one upstairs and one downstairs.
Even though the flat is on the 4th floor, there is no need to carry your heavy suitcases all the way up, a small lift makes it really convenient to get to the flat and back in the streets.
All in all I would highly recommend this flat and I'm sure that I will be back one day!