Very clean. Excellent continental brekfast: panini grill, good coffe, wonderfull freshly baked coissants :). English speaking staff, which in my expereince is a rarity in Italy. A bit far from the seaside, but hotel provides bycicles to travel around the city and to the beach :), so distance is not a problem.
A stay at Hotel Mastai places you in the heart of Senigallia, within a 15-minute walk of Theater La Fenice Senigallia and Garibaldi Senigallia Square. Featured amenities include a 24-hour business center, complimentary newspapers in the lobby, and a 24-hour front desk. Free self parking is available onsite.