We had a great stay in Prague thanks to this flat! Rob and Meg were great hosts. Though we didn't meet them, they had a colleague who was able to meet us, show us in, and help us with our bags. He also provided some flexibility in terms of arrival, as we arrived by train and hadn't booked our tickets until the day before. There is an elevator in the building but you would still need to ascend two flights of stairs (one very small set of 5 or so stairs and another small spiral staircase) to reach the flat. This was worth it for the spectacular views, but could be challenging if you have mobility issues.
The flat was sun-lit, very bright, well-decorated and well-appointed. They had tons of helpful guidebooks and maps, as well as a Czech phrase guide. Rob and Meg's restaurant suggestions also came in very handy, as we had an amazing meal at the restaurant downstairs. The washer/dryer also worked very well, which we needed during our long travels. The bathroom also had a stand up shower in addition to a tub with jets, which is quite the luxury! Not to mention there was plenty of space to spread out throughout the flat.
The flat is well-located for touring Prague but the street wasn't too filled with tourists. It was close to several good food and drink options and a very brief walk to where most tours leave/major sights. I would highly recommend this flat and would stay here again!