Santo Stefano degli Abissini in Vatican City (Rome). The oldest still standing church within the Vatican (dedicated to St. Stephen the Protomartyr) was given to Ethiopian Monks by Pope Sixtus IV in 1479:
The church is served by clergy from the nearby Pontificio collegio etiopico (the pontifical Ethiopian seminary). This house had housed Ethiopian clergy and pilgrims for centuries until it was converted into a theological college in the early 20th century:

The church is served by clergy from the nearby Pontificio collegio etiopico (the pontifical Ethiopian seminary). This house had housed Ethiopian clergy and pilgrims for centuries until it was converted into a theological college in the early 20th century:
