Stay in the heart of Siena – Excellent location – show map Offering free Wi-Fi, Casa di Osio is located on the third floor of a residential building a 5-minute walk from Siena's Fortezza Medicea. Breakfast is served daily and includes hot drinks, croissants and cold meats. Classic rooms feature a flat-screen TV and a shared bathroom with shower. Casa di Osio is 1,650 feet from Piazza del Campo, the city historical center. The Cathedral of Siena is a 10-minute walk away.