The house is perfectly great and cozy and very clean. The room is completly conform to the picture posted. Also, the bed is satisfactory and can fit 2 persons but since I was alone I've enjoyed having all the bed just for me :-) .
The location is great, just maximum 12 minutes to the Central Station and around 30-35 minutes to the airport with the Arlanda Express train or you can take the bus, which of course take longer but cheap.
Frank and Jennie are such a lovely couple, very kind. By the way, I hope you'll have the opportunity to taste their fruit juice made and smoothie homemade cause it's so yummy.
I'll definitely recommend Frank and Jennie's appartment to anyone without hesitation.