The Titanic had a total of over 371 First Class Staterooms, 41 of which could be used as 2nd class staterooms.
On A Deck there were 36 Staterooms labeled from A-1 to A-37 with no room called A-13 for superstition.
On B Deck there were 101 Staterooms all styled in different periods and labeled from B-1 to B-102 with no B-13. B-51 and B-52 were counted as staterooms even though they were only sitting rooms and had no beds.
The most expensive cabins were located here: B-51, B-53 and B-55 were all connected by a private promenade, idem for B-52, B-54 and B-56. The even numbered cabins were used by Bruce Ismay (the same suite that Cal Hockley, Rose and Ruth Dewitt-Bukater's characters inhabited in Cameron's film; see popular culture below) while the odd numbered cabins were booked by the Cardeza family. Based on photos of the RMS Olympic, B-52 was styled in the Empire style. B-56 was possibly styled in Old Dutch.
On C Deck there were 134 Staterooms. Again there was no C-13.
On D Deck there were 49 Staterooms labeled from D-1 to D-50 with no D-13.
On E Deck there were 4 First class staterooms (E-200, E-201, E-202 & E-203) and 41 rooms which were alternative 1st or 2nd class counted as 1st class labeled from E-1 to E-42 with no E-13. All of which were located on the starboard side of the ship.
The Promenade Suite was painstakingly reconstructed for the 1997 film Titanic. In the film, the DeWitt-Bukater family is booked in B-52, B-54, and B-56. B-56 was Rose and Cal's Stateroom. If you notice in the videos below, numerous bouquet of flowers can be found in the bedrooms. They were likely delivered to their staterooms on Sailing Day as a congratulations on their recent engagement and Bon Voyage gift. After Wednesday April 10th they are put in silver vases and placed around the rooms. One passenger recalled there were so many flowers on board she said Titanic was "a ship full of flowers". Nothing but the best and freshest for 1st-Class Passengers. All staterooms will also be shown in the upcoming video game Titanic: Honor and Glory.