You have to consider the room (or rooms) that was advertised and rented as a separate entity, not part of your personal residence.
The question is really asking you if you used the rented portion of the apartment for personal purposes. If it was rented for 29 days, then presumably you did not use that space for personal purposes during that 29 days. At most, you only used it personally for the rest of the year (366 days - 29 days).
The question about the percentage of rental use is asking you how much of the apartment was considered a rental property. This would generally be determined by the square feet of the rental room versus the total square feet of the apartment.
All of these questions are being asked in order to determine the pro-rated amount of your expenses than can be claimed against your rental income. You will only be able to claim expenses for the period of time that the room was rented and for only the portion of the total apartment that was rented.
Here's an example: Suppose the room was rented for one month or 1/12th of the year. Also suppose that the rented room is 25% of the total square feet of your apartment. If your utility bill for the whole year was $1200, then you would be able to claim $25 of that $1200 against your rental income.
@petermoss
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