Separable or inseparable decides the head
The tax turns on one question: can the rent for the building be separated from the charge for the amenities and services? If it can, the two are taxed separately: the rent for the building is income from house property under Section 22, with the flat 30% standard deduction, and the charge for the furniture, amenities or services is income from other sources under Section 56, on which you deduct the actual costs. That is the better outcome, because you keep the 30% deduction on the building rent.
If the letting is inseparable, though, a single indivisible arrangement where the building and the amenities go together and cannot sensibly be split, the whole composite rent is taxed as other income, or as business income if it rises to that, and not as house property at all. And here is the sting: once it is out of the house-property head, the 30% standard deduction is gone, and you can only deduct your actual expenses and depreciation. So the same cash rent can bear more tax simply because it was bundled inseparably.
Why it matters, and the NRI angle
The 30% standard deduction is generous, you get it whatever you actually spent, so losing it on an inseparable letting genuinely raises your tax. A furnished flat let for one all-in figure, with no split and the furniture integral to the deal, risks being treated as inseparable and taxed without the 30%. Structuring the tenancy so the building rent is clearly identified and separable, where that reflects reality, preserves the deduction.
For an NRI there is a withholding point that does not change with the head. Whatever the income is called, house property or other sources, the tenant still deducts TDS under Section 195 on the full sum paid to you, because it is all income to a non-resident. So the classification affects your final tax, through the deduction, but not the tenant's obligation to withhold. A practising CA structures and reports the composite rent to keep the 30% deduction where it genuinely applies, and computes the tax correctly where it does not.