1. windows: further is stated that only left hand (‘best’) rooms had windows, so you answer yourself in your own quoting. Though number of windows is not stated textually, but, so far as the sketch made by Tolkien himself shows 5 of them, it may be assumed that there were five indeed.
2. Other rooms (not only those listed by JRRT) are also expected to be found in hobbit holes (the description was made to make an impression how luxury was a hole possessed by bilbo, it was not a real estate agency's price list of a house for sale or rent
3. No, not all the hobbit holes were similar to that one of Bilbo's, for it is said that
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Bungo, that was Bilbo's father, built the most luxurious hobbit-hole for her (and partly with her money) that was to be found either under The Hill or over The Hill or across The Water
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Bagginses were richest family of the neighborhood. Poorer families lived in far more modest lodgings, and poorest had mere dug-outs with no windows at all.
4. Most of the hobbits lived in holes, but there were exceptions, for there were above ground buildings too (Crickhollow for one)
5. Lavatories (inside the building type, with sewers) have no textual evidence either, but existence of bathrooms is proved. There is
A warm bath and late breakfast on the lawn afterwards quote, aslo there was a bathroom at Crickhollow, but it had no outflow, for it was overflooded by Pippin
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‘Lawks!’ said Merry, looking in. The stone floor was swimming. ‘You ought to mop all that up before you get anything to eat. Peregrin,’ he said. ‘Hurry up, or we shan’t wait for you.’
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therefore existence of toilets inside the holes is doubtful, but Crickhollow was an ordinary house in the country, and such a luxury lodging as Bag-End was, may have had a sewer pipe and a toilet inside.