Does 'love not the world' mean Christians cannot enjoy nice things or have a nice home?
No. The 'world' in this context is the world system—economics, politics, entertainment, and pleasures—not good things themselves. The admonition forbids loving that system, while explicitly allowing enjoyment of good things, a nice home, and life's amenities, just as the love of money, not money itself, is the root of evil.
Les explains that the word "world" here is not the physical planet but the whole world system, from which we get "cosmopolitan," meaning a citizen of the world. That system includes economics, politics, entertainment, pleasures—both good and bad. The admonition "Love not this system" does not mean you cannot enjoy the good things, cannot have a nice home, or cannot have some of the amenities of life. The issue is love and allegiance, not possession or enjoyment. He compares it to the statement that the love of money, not money itself, is the root of all evil; the love of money corrupts people in order to get it. In the same way, believers can enjoy some of these things the cosmos offers, as long as they do not let it become their love.