Alberto’s place is clean, tidy, comfortable and stylish. It is well located outside a bus that runs often (but not in the very early hours). The bus network takes you anywhere you need to go. You can but single use tickets on the buses but my advice:- buy a ATB tourist pass which you can use for all the bus and tram network. Taxis are expensive and UBER is not really a thing here.
Also dont leave the airport before you sign up for the free Bergamo wifi hotspots all over the city. If you travel without data you will not be able to access these otherwise.
The closest supermarket is AUCHAN it is only a 1km walk. You will need to take your own bags. Good pizza shops within a few hundred metres and a great cafe in the complex. There is also a market in the car park on Thursday mornings. Definately make time to go to the Città Alta - its beautiful - thanks Alberto!