Hi Lee
I reckon that's a nice easy 1 hour job, including travelling. (I'm guessing it's near other work).
So whatever you fancy for an hour? Nice property, good access, easy parking. I reckon your price is good (I'd stick with the 2 monthly).
Personally, I wouldn't even take it on, I'm 56 years old, refining my round, with loads of work coming in.
I couldn't be bothered with those dormers and velux, I am getting a lazy git!