Sortavala is generally safe for solo female travelers. The locals are typically friendly and helpful. However, note that English isn't widely spoken, so communication can be challenging. Petty crime rates are relatively low, but as in any region, you should keep an eye on your belongings. It's also essential to respect local traditions and social norms. The public transportation system is reliable, but it may help to have a working knowledge of the Russian language or have a translator app handy. It's recommended you stay vigilant, especially during the night, and stay in well-populated areas. As always, it's important to adequately research and prepare for your trip, including potential cultural differences.