I stayed 1 month at Karoline's. The flat is very clean and cosy. Regarding the bedroom it's very light that is nice but if you need dark to sleep you won't manage. She tried her best to create instaneneous curtains for me tho. Karoline is very reactive when you need something.
She lives with her son and they wake up very early in the morning (around 6am). They always try to be discrete but there is no door in the living room so you listen to the TV every time it is on. So if you are a morning person there is no problem but if you are not you might be waken up if you have a light sleep. There is also no micro wave so if you are a lazy cooker it's not easy.
The flat is well located in a calm district not far from the center and it's quite cute. I would definitely recommend it if you want to stay for few weeks as rents in Stockholm used to be very high and there is no so much flats to book.