We really enjoyed the time at Katerina‘s place and highly recommend the apartment! She helped us with where to rent a scooter, the transport from and to the airport and had many tips for our vacation including some very nice restaurants. With a scooter a lot of nice beaches are within 5-10 minutes reach and the drive to Fira is also very doable. To get to Oia we would recommend to take one of the many busses, even if a scooter-drive is also possible. Cheers