Even though I didn't meet Joana personally, everything went smoothly. Her flatmate is such an easy-going person, said I am welcome to use anything in the bathroom and the kitchen and explained everything to me. If you prefer to cook your own meals there is a well equipped kitchen (except for a dishwasher and a microwave).
If you are sensitive to noise you will probably need earplugs to sleep well (they are provided). My impression is that they have tried their best to improve the experience for every guest they have. Location is very central in a multicultural quarter and for an incredibly good price in Oslo. I can absolutely recommend Joana's place!