Marion's place is very centrally located, a short 5-10 minute walk from Finsbury Park tube. She is a short walk from a lovely high street with a Tescos, a post office, pharmacy, and many restaurants (try Pizza Pappagoni, amazing).
We were in London visiting family, so had a large group so the arrangement of rooms was perfect for us. There are three double bedrooms, and one bedroom with a bunkbed. The lounge is upstairs and there were a selection of toys for the kids to play with.
The bathroom is on the top floor, but there is a loo (toilet) on the ground floor for convenience. She has an electric shower over the bath for instant hot water.
The kitchen was rather small for 4 bedrooms - but that is London kitchens for you! It was wonderful to have a gas stove/hob to cook on.
This is a family house, so don't expect designer perfection - but the rooms were all good sizes and everything worked well.
Parking at the house is tricky - but in London you should be using public transport anyway! You could pay for 2 hours of parking outside of the house (using your mobile phone), or there is a parking garage down by the station should you need to stay longer. Parking wardens in London are notoriously fierce, and it's restricted from 8.30am-6pm.
We used the washing machine, and took clothes down to the local laundromat (<5 mins away) when we were beset by rain and couldn't dry the clothes outside
Marion was lovely, and so easy to communicate with (despite her being out of the country while we were there).
We would happily stay there again, as it was fantastic value for money.