Well, it seems like you're on the right track. Maybe try and map out the rooms and how they connect on paper, see what happens :).
Some items are decorative, some are not, plants do embellish a room though.
Should I also draw the floor tiles. I found that some floors and walls in the beginning area have different textures and I don't know if its just aesthetic or if it has some other meaning. Im wondering this because in the room with that person with the glasses there is a different texture for the middle tile, the tile the person is standing on, and the table.