North-east direction is the best for guest room. The second suitable option is north and the third option is east. Even south-west direction is okay as per vastu. Another point to notice is that there shouldn’t be a temple in that room. Also, the photograph of the ancestors should not be put in that room.
Wall clock can be put in north or east direction. The north wall should be bright in color. A looking mirror should not be placed in front of the bed.