I didn't get to meet Katerina but she is very nice and communicates very well. She gives lots of tips about places to go and activities to do in the city regarding your interests, and she explains well how to use the apartment before you arrive in it.
The apartment is cosy and confortable, you feel good in it, for one person it is perfect and for two it is great as well. the bathroom is just a little bit too small but it was not annoying for me because I was out most of the time to visit Oslo :)
The location is very good, you have buses, tramways and metros close to the apartment and the neighborhood is nice and colorful and also very safe!