The Sala Terrena at Singerstraße 7 occupies the ground floor of what became Mozarthaus Vienna, though its vaulted ceilings predate the composer's 1784 residency by nearly two centuries. Built as a reception hall for the Camesina family in the early 1700s, the space follows the Italian terrena tradition—groin vaults anchored by stout pilasters, stucco work framing allegorical panels, a floor plan designed to channel sound rather than absorb it. When Mozart moved into the upper apartments, the hall already served occasional chamber gatherings; today it functions as Vienna's most intimate baroque concert venue, seating fewer than sixty patrons beneath frescoes that have survived three centuries of political upheaval and wartime proximity strikes. Sala Terrena tickets grant access to nightly performances staged in a room acoustically optimized by accident. The low ceilings and stone surfaces create a resonance chamber that amplifies string quartets and solo fortepiano recitals without electronic reinforcement. Ensembles perform Mozart, Haydn, and Schubert repertoire on period instruments, often in the same configurations the composers intended—two violins, viola, cello, no conductor. The space seats audience members within arm's reach of performers, eliminating the proscenium distance that defines larger concert halls. Concertgoers arrive through the same doorway Mozart used to access his second-floor study, though the original wooden portal was replaced after 1945 reconstruction. The venue's location at the intersection of Singerstraße and Blutgasse places it within Vienna's densest concentration of eighteenth-century residential architecture. Ticket holders entering from street level descend three shallow steps into the terrena—originally a garden-level space, now below the raised modern sidewalk. The hall maintains its function as a semi-public gathering room, much as it did when aristocratic patrons commissioned private performances before the rise of commercial concert culture. Performances begin at 19:45 on weekdays, 17:45 on Saturdays, with no intermission; the single-movement structure mirrors the salon concerts Mozart himself attended in this neighborhood. Reservations open six months ahead, with front-row seats assigned first-come within each booking tier.