The appartment is absolutely worth the money. It's comfortable, has all the necessary facilities in the kitchen and bathroom (and has good quality wifi! :-) ). The guest room is spacious, has a comfortable double bed, a wardrobe and a few guides which might help you plan your daily trips around the city. The appartment is located in an attractive area, with shops and restaurants, close to the city center but without the street noise (small park nearby). The host is very friendly and helpful in organizing trips and gving tips.
If you're considering renting the room from Nina, don't hesitate. You won't regret it :)