In F. Scott Fitzgerald's novel The Great Gatsby, Tom Buchanan's comment "I've got a nice place here," can be seen as an understatement and ironic. 

It is an understatement because Tom's house is located in East Egg, which is a peninsula outside of New York City that has a twin landform known as West Egg. East Egg is known to be the more fashionable of the two islands. Nick says of Tom: 

His family were enormously wealthy--even in college his freedom with money was a matter of reproach--but now he'd left Chicago and come East in a fashion that rather took your breath away: for instance, he'd brought a string of polo ponies from Lake Forest. It was hard to imagine a man in my own generation wealthy enough to do that.

Nick describes Tom and Daisy's house in this passage: 

Their house was even more elaborate than I expected, a cheerful red and white Georgian Colonial mansion overlooking the bay.

This is why it is an understatement for Tom to describe his house and grounds as a "nice place." It is more than nice, it is extravagant. 

This statement is also ironic because he is not a nice man. He's a bully, bigoted, morally repugnant, and racist. He is a terrible husband, having constant affairs, and a poor friend, as well. The beauty of his surroundings hides the pain and discord of the home he has created with Daisy.