This apartment is exceptionally located. You will not find a better spot in Prague. You are central to old town and all of the best sites. We walked everywhere. Close to good restaurants, crossing the bridges, shops, and close to the sites. The apartment really has 3 bedrooms, with another mattress in a loft that is accessible by crawling up a ladder to the loft, which has a ceiling so low, you can’t stand up. Another mattress is in a small room off of one of the bathrooms. (Neither of these 2 beds had the nice bedding either.)
The apartment was very very clean, beds were very comfortable with nice quality bedding. The only space to gather is in the kitchen with a large table. There is no spot to just hang out on a comfy couch, just the kitchen. This was not a big deal for us, we toured all day and came back after dinner and headed to bed. The decorations and amenities are sparse: towels and hand soap are available but not really anything else. There are many signs posted about keeping quiet, and a grouchy neighbor is clearly the reason for this. The first night (it was around 5pm) when we were walking up the stairs to the flat, our kids were laughing and talking and the neighbor came out to yell at us.
This spot is a good value for the price. I would stay there again and do recommend, but it is really best for a family, since two of the bedrooms connect to each other.