I stayed here for five nights during the first week of October, and found the apartment ideal for my needs. The apartments are located in a quiet side street close to the Old Town, and a few minutes walk from the Metro. As a somewhat older traveller, who needs her sleep and peace and quiet this fitted the bill perfectly for me. They are evidently very popular, which is always a good sign. I booked my apartment a good six months in advance, and there were only a few left then, with the remainder gone within a week.
I stayed in apartment 33a which is on the top floor. The apartments are basically like small studio flats with a shared bathroom with the apartment across the hall. The apartment had a nice comfy double bed (twins can be requested instead) with a lovely warm duvet, a small kitchen area and a TV with table and chairs. The kitchen was more than adequate for my needs, with a few electric rings, plus a microwave and fridge and all the equipment that I needed to cook at least the basics.
The bathroom too was fine with a lovely hot shower. There is no lift, so I can see that getting up the stairs for those with lots of luggage may be a problem, but for me it was fine, as I like to travel light. While there was at times some noise from the apartment next door, it didn't mar my sleep too much. The street itself was certainly very quiet given its proximity to the Old Town.