This is an unfortunate aspect of this app when it uses just nice in English to describe objects. Nice car, nice city etc. A few examples with the inserted meaning as used by editors when clarifying quotations would be useful. e.g. Nice [looking] car etc. Pretty, and hansome should be used only for people (and animals).
It is not pronounced as K but as Ť https://en.wikipedia.org/wiki/Voiceless_palatal_stop and the reason is the same. Please do read those Tips and notes as I recommended to Diego. Come back to ask if something is unclear.