We reserved a basic room at the Colonna Suite del Corso. We did not realize that there were 2 different basic rooms. The first one displayed in the photos on the booking site appears to be superior to the two rooms.
Size: The room we were given, the purple one in the photos, was extremely small. We estimate that it measures 8.5x10 feet not counting the bathroom.
Amenities: The mini fridge was broken and we had to throw out the cheese and meat we had bought for a picnic because we didn't realize in time. There was no chair or mirror in the bedroom area for doing ones make-up. The shower cap, fresh towels each day and soap were nice touches as was having access to a snack bar (we did not buy anything).
Bathroom: the shower was large with great water pressure. The best feature of the hotel, but very dark. Unfortunately the fan didn't work well so the bathroom became very steamy.
Staff: the woman we met on arrival was very kind and sweet, as was the gentleman who called us as courtesy to inform us of an upcoming city wide public transportation shortage due to a Marathon. There was another woman who was a little less accommodating - when my partner requested to borrow a knife (for our picnic), she roughly informed him that eating in the room was against the rules. I have since reviewed the rules again and still find no such mention.
Location: absolutely amazing, close to all major sights, public transportation and restaurants.
Would not stay again.