Guido is a very good host; he was waiting for us at the apartment and provided plenty of info about the apartment and the city, including a map where he marked the best spots as monuments, restaurants (a couple with a 10% discounts if you say that you are staying at Guido's), bars and pubs where the locals hang out. The apartment itself is huge, located around 20 minutes walking from the train station (last 200 meters are on a steep and uneven street, so it may be inconvenient if you have an heavy trolley) but just a few steps from Bergamo Alta, the old part of the city which is truly beatiful, so, even if you're only staying overnight
just to catch a fligh from Orio al Serio, don't miss it! The area was safe, quite even on a Friday night, beds are extra-comfy and the rooms are nicely decorated in a cool minimalistic way (travel guides, stylish lamps, an orange couch and quotes about travelling painted on the walls). We also availed of the transfer to the airport at 5,30 in the morning; even with short notice, Guido was really accomodating.