Dear Chérie, I'm so sorry for the inconvenience and I feel a bit sad you didn't inform me while you were in the house. We always try to solve problems as soon as we would have come over, possibly with the plumber, to see if we could help you. We never had smell on the terrace before and we think it is because of the unusual dry and hot weather (drains are dry). We immediately informed the following guests and adviced to pour extra water in the drains.
As for the flies : every summer, especially during Sunny periods, our strictly agricultural region has many insects. They love the fields and cattle in the neighbourhood.