There are six prefects in each house, two for each year.
No, it is yet another 'film-only' event. The house is never burned down in the Harry Potter books. In fact it is a very important location for the beginning of the final book as some key events occur there.
Slytherin has bad connotations despite the fact that not all slytherins are bad, Gryffindor has good connotations just because that is the house that harry is in but not all Gryffindors are good.
Gryffindor, like Harry and Ron (and the rest of the Weasley's)
According to the books, those who are brave and loyal shall dwell in the mighty house of Gryffindor. Gryffindor's mascot is the commonly thought to be brave lion, and its colors are maroon and gold.
Harry Potter set Dobby, the malfoy's house-elf free by giving him socks.
Hogwarts' sorting hat
There is a House Elf and his name is Dobby.
The Weasley's house was never destroyed in the books, this only happened in the movie Harry Potter and the Half-Blood Prince.
7 is a magical number in Harry Potter. There are 7 Harry Potter books. Also, wizards are considered adults when they are 17. Number 4 Private Drive is Harry's address for most of the books. 12 Grimmauld place is Harry's inherited house.
In the Philosopher's Stone, Percy Weasley was a prefect. In the Order of the Phoenix, Draco Malfoy, Hermione Granger and Ronald Weasley were the Hogwarts prefects along with others too.
I don't think House of Anubis has any books (sorry), but you may like the Harry Potter books by J.K. Rowling :)
If you are talking about the Weasley's house, that didn't happen in the books, the movie only added it.
House elves are extremely servile in the Harry Potter stories. Wormtail, aka Peter Pettigrew, is also pretty servile.
Make sure you have enough points to beat them, best not to get caught by any prefects (unless if you're Goyle)
In the harry potter movies and books the vernon house is known as number 4 privet drive
a lion. well, the griffindor house of the harry potter books has a lion symbol.
Harry Potter played for Gryffindor house.