This is Simon the Tanner’s house in Joppa, Jaffar, Acts 10: 6, He (Peter) is lodging with Simon, a tanner, whose house is by the sea. He will tell you what you must do.”
Peter came to Joppa from Lydda to raise Tabitha (Dorcas) from the dead (Acts 9:36-42). While in Joppa, the apostle stayed at the house of Simon the Tanner. When Peter was praying on the roof, he had a vision of a large sheet filled with animals being lowered from heaven (Acts 9:43–10:23), signaling to him to go with the messengers from Cornelius. The Church of St. Peter marks the traditional site of Peter’s vision of the great sheet.