A very nice appartement with a perfect location (city center, close to the Duomo, and to the metro and tram lines). the best place if you want to visit Milano without taking the public transport, and then visit cities and lakes nearby( with the metro your are at 20 min. to milano centrale or porta garibaldi, the main trainstations and from there it's very easy to do day-trips to the lakes, monza, brescia, bologna...).
We haven't met Guido personnaly but his staff who welcome us was very nice. and Guido was always very reactive to answer our questions. The appartment is big enough for 6 people. nice beds and big kitchen (no microwave).
just one thing : there is the tram line in the street down below ( via torino), operating all night long ( or so we thought ^^) and if you are very sensitive with noise it could be a little bit too noisy. wasn't a problem for me, i slept perfectly all the nights, but its important to mention. the building is very quiet tho.