Winning with the Ruy Lopez 1 (an. game incl.)

Today I once again had the opportunity to play a game with longer time than before. Today it was a 17/0 game, and I played white opening with the Ruy Lopez:

I have only had time to look at the opening so far, and found that I possibly should have played 5.d4 for a central gambit instead.

See comments below concerning the first 14 moves.

About the end of the game:

The discovered attack on the Rook with 15.Nb6 was what decided the outcome of the game. Black lost the exchange and would have lost another pawn because of Nxe5 with the B pinned to the R (16...RxB 17.Nxe5 Bxe5 18.RxR#)