Number system:
The rooms to the left (bigger) from bottom to top as shown on the picture:
V101, V102, V103, V104, V105, V106, or, depending on the floor, V201...
The rooms on the right from top to bottom:
V107, V108, V109, V110 or, depending on the floor, V207...V210
Please note: V401 - V410 are smaller, but have their own balconies