Exactly as advertised. There are two rooms plus the bathroom/shower, each room with a 2nd level. The one room has a twin bed on the bottom and another at the top (along with the washer/dryer/ironing things). The second room has the kitchen at the bottom and large bed at top. Really efficient use of the space and would work out especially well for families of 2 children (10+), such as ours.
As others have mentioned, super-clean and everything as expected (in particular, the air conditioning is great, as is the water pressure). The apartment is very secure on a (relatively) quiet street. Easy access (1 minute walk) to the buses at Chieza Nuova stop (recommend getting a bus pass and Citymapper app).
For the US travelers--the apartment has a washer/dryer; it is much slower than you might be accustomed to, but its one machine, so even if it takes hours and hours, you wind up with nicely clean & dry laundry.