Odessa, overall, can offer a reasonable level of safety to solo female travelers. That being said, there are certainly some precautions to be taken. It is wise to avoid less touristy and dimly lit areas, especially late at night. Street crime such as pickpocketing, particularly in crowded places, is not uncommon, thus vigilance and keeping your belongings secure is recommended. It's beneficial to have basic knowledge of Russian or Ukrainian languages as not everyone may speak English. It's advisable to respect the country's customs and traditions. Public transport is generally safe, but private cabs might not always be reliable. Having a reliable contact, plenty of common sense, and staying in well-populated areas can make a world of difference. However, it's crucial to mention that local people are generally kind and willing to help.