We stayed at Janina's place for about 9 days for a business trip. It's pretty spacious and we found the mini kitchen and large table convenient for making a quick meal and getting some work done. Wifi is great.
I had an eye mask and ear plugs which made it comfortable to sleep. If you're sensitive to bright sunlight or city noises, I'd suggest the same. The sun rises very early and the apartment faces directly east. Like any city, you can hear noises from the street but that is expected given the location.
Overall we had a comfortable stay, and Janine was easy and pleasant to communicate with