If you ask around the locals of Odesa, "Where are you from?", they will most likely answer: "I am Odesan" instead of Ukrainian. Due to its strategic location on the coast of the Black Sea, Odesa had seen many occupants that came and went. What remains is Odesa and its population of refugees and foreigners that built the city from the ground up and made it what it is today.
From Turkish influence to Slavs and Western European influences, Odesa is a type of cities you have never seen before. One house in the same neighborhood might have Gothic architectural-style whereas the one next to it might have Brutalism architectural-style from the Soviet-era, and another next to it with a touch of the colorful Ottoman-Turkish influence. This is Odesa.
In most cities, this chaotic blend of cultures might not work but in Odesa, they do, hence why Odesa is one of the most popular cities to visit in Ukraine.