Vowels: Standard - 'a' as in 'path' or 'car', 'i' as in 'pin'.
Consonant combination - 'ny' (palato-nasal) combine 'n' and 'y' while top of tongue touches hard palate plus nasal vibration. (Avoid the English 'nee' as in 'many')
Intonation - The question is normally said with a rising tone at the end of the sentence (kiya?). In this phrase the 'interogative pronoun', 'Nyanya' (How) is also likely to have a rising tone.