never mind the pole.
The hard bit would be the staircase windows. They look high over the stairs with some very white walls. I guess that the whole place is similar, it would take quite a lot more time to do inside. If you have cream carpets and emulsion walls you need to be very careful with the water.
You could probably talk them into €500 if you did the whole thing to a high standard.
It looks like a nice easy job outside, but it would be easy to come unstuck doing the inside.