I really liked staying at Monikas. The apartment is cosy - with a small balcony. The bed is comfy and the kitchen is well equipped.
It's placed in a nice, quite peaceful area and still not far from the center of the city. With only 1-2 stops with the bus you are at a combined metro and tram station, and can easily come all over town.
Both Monika and Martin are very nice and helpful, and they answered really quick when I contacted them.
I absolutely recommend this apartment.