The apartment is in a fabulous location in the old town. It was clean and comfortable, with plenty of space for three of us. I slept on the sofa bed in the living/dining room with all the windows open at night with a pleasant breeze.Being on the third floor there was no problems with security. It was a little noisy as it is en route to the cathedral and even in the early hours people were walking about, but nothing that earplugs didn't fix. Or you could chose to close the windows and put the air con on. The noise of a busy street through the day added to the atmosphere of being in an ancient city.
The kitchen seemed well equipped, although we only prepared breakfast but I couldn't use the iron as it had a weird plug on it, possibly American.
There are a lot of narrow stairs to the apartment, in keeping with an old building, but for someone reasonably fit with small luggage they shouldn't be a problem.
The little roof top terrace is a bonus and we did go up there at different times of the day to enjoy the amazing view.
As others have mentioned there was building works going on right next door.It was noisy and intrusive at times, and disappointing that we weren't informed of this by the host beforehand and only found out by reading recent reviews.
However we still managed to enjoy the apartment and our four day city break.