We were three boys and stayed for 3 nights in this apartment.
This apartment is very good located and pretty close to the cathedral. You can reach everything by foot within 10 minutes. The interior is improvable - especially if you travel with 3 adults. The sofa is too small to sleep on it and the provided extra folding bed was very uncomfortable.
Anyway, if you are travelling as a couple or just with a friend, I would recommend you this apartment. If you are travelling with three adults, I would not.