Islamic Revival explains the difference between ease of living which is permissible, and the luxury that corrupts (Taraf) which is impermissible in Islam:

Thereupon the luxury (Taraf) which the Qur’an condemned, and Allah prohibited and considered a sin is the Taraf that linguistically means haughtiness and arrogance due to ease of living, but not the ease of living itself. Therefore it is wrong to interpret Taraf as enjoying the wealth and ease of living by that which Allah provided, because ease of living and enjoying the provision of Allah are not condemned by Shari’ah.