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It is better to say "Очень хороший ответ!" or "Ответ мне помог!". "помогающий" is not used by natives in this style.


We don't say so.


It's better to write "4 этажа + подвал" or...

Floor of "цокольный этаж" must be under "уровень земли" by half (maybe less, but not more). It's "Semi-basement" in english.
"Этаж" with level of floor above or equal level of ground is the first...