I stayed for a month and the internet worked pretty well the entire time.
Location is a big plus, close to everything and yet in a quiet street.
However, I have to agree with the reviews where say that the mattress was uncomfortable, noisy and it had lots of dust around the place - not sure how long the place was closed for.
My first night was cold and uncomfortable, but the host was super kind and brought a small external heating (you can't adjust the one in the apartment and I felt super cold, even during Spring).
I love cooking but the dishes were kind of gross inside of the cupboards that I decided to eat out most of the days (even though it is a fully equipped kitchen).
Great selection of towels, toiletries, hand soap, etc, only missing cleaning supplies. There is a free washing and dryer in the scary building basement but it works pretty well.
Check-in/out pretty easy and I believe that would be a nice apartment with some TLC.
Remember that this is the old part of the town, so do not expect anything brand new and shine.