Just to put you in the picture, I stayed in Jessica's Summerhouse in December (Winter) but this made no difference. The cabin is clean, comfortable and above all warm and dry. So here is my experience of the cabin, location and Jessica. The cabin is small as expected as from description, but it has everything needed for me as a single traveler. The bed is comfortable, there is a microwave, kettle, water, tea and coffee plus snacks if you need them. WiFi worked well for me. There is a small loo for emergencies (after hours) which I used quite a lot over my 2 night stay. The bathroom in the house is excellent in being clean and having a great shower.
The location is easy find on maps, in a safe area with a safe short walk from Haymarket or the centre. The surrounding area is very scenic.
Now about Jessica, first point is that communication was excellent before and during my stay. Jessica is friendly, very helpful and accommodating. Oh and not forgetting the flapjack gift on leaving.