We booked a tour in the afternoon/evening with 3 colleagues to visit Thessaloniki's architectural highlights. Ioanna proposed a tour through the center, showing us the Agios Dimitrios church and the White Tower, archaeological spots such as the Roman forum, and more. Ionna is herself an archaeologist, so she knew a lot about the archaeology and history of the city. But she also showed us the modern side of the city, such as popular spots for the locals. Overall Ionna was a great guide and I would definitely recommend taking a tour with her :)