This is the 5721st most frequent Russian word.
приятное
Pleasant.
The word 'приятное' here is used as a noun form derived from the adjective 'приятный' (pleasant), referring broadly to something pleasant.
Я люблю начинать день с чего-то приятного.
I like to start the day with something pleasant.
Here, 'приятное' modifies 'ощущение' (sensation) as an adjective, describing the sensation as pleasant.
Приятное ощущение охватило меня, когда я услышал эту новость.
A pleasant sensation overtook me when I heard the news.
The word 'приятное' is used here as the adjective 'приятный' agreeing with 'освещение' (lighting), suggesting the lighting was pleasant.