Dear Joanna,
Room No. 6 is the Imperial Lobby - this lobby is located on the upper deck, forward of the Imperial Dining Room and adjacent to the Imperial Day Cabin (the latter one often being confused with Nicholas study). I can understand that you identified this as being the Lobby behind the Imperial Dining Room. Both lobbies have similar looking staircases leading to the main deck Imperial Suites, but the wall to the left side of the staircase and the lack of a corner sofa to the right of the staircase identifies this as the lobby in front of the Imperial Dining Room.
Room No. 7 is for sure one of the Empress Suites on the main deck on starboard side. To be exact this is the one neighbouring to one of Nicholas' suites to which it had a connecting door.
a - the big, rectangular, window identifies it as a suite on the main deck
b - the location of the furniture identifies it as her room - besides the chintz and use of light colored woods
c - the side table is the original one that came with delivery of Standart from the shipyard
Anna had a cabin on the lower deck below the Empress suite - her cabin is one of the three cabins that are labelled on the original plans as Empress Spare Cabin.
I will put up scans of all rooms as to support identification - I was in Denmark over the weekend but will start shortly with the identification of all rooms.
Looking forward to your support,
Harald