What should I put for my address when applying for a Thai visa if I’m staying with my girlfriend without a lease?

When applying for a Thai visa and staying with your girlfriend without a formal lease or rental agreement, it is advisable to provide her address on the application. Additionally, it can be helpful for her to write an invitation letter that includes her ID and possibly a declaration that you will be living there. This documentation can help clarify your living situation to the authorities. Some users suggested alternative options like booking a cheap hotel, but it is important to ensure that your application reflects your actual living arrangement.