If you did not perform maintenance or cleaning on some of the days, then those days should be considered 'personal use' days. But, only you know how long you actually spend working on the days that you are performing maintenance or cleaning. Other days of personal use would include any time that you allowed another person to use the property without paying rent. If you deem that all of the days you were at the property were for business purposes, then the property would be considered to be 100% business use.
As for the days rented at a fair rental price, that would be the actual days it was rented. Vacant days do not count even though the property was available for rent.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"