What should be included in a letter confirming accommodation for a Type O visa application in Thailand?

When applying for a Type O visa based on marriage to a Thai national, it's necessary to submit a letter that confirms where you will be staying in Thailand. This could be either a homestay or the residence of a family member. Other users suggest that the letter can be a simple invitation from your spouse, confirming your stay at her house. Additionally, it's mentioned that you can provide proof of a hotel booking for 3-5 nights instead, which can be canceled after the visa application is submitted. Ensure that the letter includes basic details and is straightforward.