My wife and I stayed 7 days in this nice apartment.
The wifi works perfectly and real fast.
The location is great, just a few meters from the train station/bus station, and close to the main attractions of the city.
If you arrive by bus, do not follow the google instructions, go instead, through the train station, getting out at main entrance.
By the way there is a very good Tourist Information Center close to that entrance.
Just be aware that the apartment has this huge window, but wiht no curtains on it. As in this time of the year in Norway (beggining of summer) the sun rises around 4 am and sets around 11 pm, it was a little hard for us to get a good 'night' sleep.
The owners are very frendly and will do everything to help you, they answered all our emails promptly.