I saw an interview of David in the official Roland Garros newspaper... Sadly I lost the paper so I can only tell you what I remember. They asked him some really simple questions with simple answers.
The word he likes the most is "positive". The one he does not like, logically enough, is "pessimistic."
What he dislikes the most in people: dishonesty and hypocrisy.
His main quality: his ability to work hard and do his job well.
The most important thing in his life: his family, his friends and Javea.
His favourite fictional character: he said he did not really know but maybe Batman.
The noise he likes the most: the noise of the Central Court when it's packed.
The noise he hates the most: the sound of an ambulance.
His favourite swear word: They translated it into French but I believe that was "Puta!"
Does he believe in life after death? : He does not believe in God, and therefore, he believes that when he dies, nothing will happen.