I would give 3.5 stars if I could :)

Good central location. Clean, comfortable apartment. Bed was comfortable and not too hard, as some European beds tend to be. It was a 5 minute walk to the train station and easy to find from the Airport Express bus (for 3 euro each way) that stops at the train station.

We walked to everything within about 20 minutes, or would ride the subway to the far end of our excursion and make our way back to the apartment. It is a 6-8 minute walk to the Old Town Square. Very easy and comfortable.
Our complaints: We felt like a hassle to the owners. They gave us the key, but wouldn't let us keep our luggage at the apartment while the cleaning lady cleaned. We had to tote the luggage over to the train station and pay 4 euro for 2 hours of luggage storage. Normally a non-issue, but my wife is almost 8 months pregnant and walking was more difficult.
Other complaint was the blankets/ duvets were too small. They were about 5'6' or ~170cm. If I covered my feet with the blanket it would cover up to my nipples or so. They were warm enough, but not large enough. The plus side was that we could control the temp of the room, so we didn't freeze, but I usually like a cool room and warm blanket.