Cost for plastering 4 walls and ceiling

I have just been given a quote for one of my bedrooms to be PVA'd a skimmed, all walls and ceiling. The size of the ceiling is approx 12m2.

All materials and labour £350, is this a reasonable price? All walls are prepped ready to go.

Thanks

 

9 ft

 

Thanks for your opinion it certainly seems a reasonable price. two of the walls are not huge as there is a built in wardrobe on one and a large window on the other, but i understand plaster in general will take 2/3 hours regardless of how big the walls are.

Thanks again