We had a great 6 night stay at Jan & Sarah's apartment. Jan met us at the airport for only 300 Koruna (about 12 US Dollars) which was really helpful and convenient after our very long flight from the United States. Jan was there to pick us up right when I texted him - no complications at all. He was super friendly and chatty and we learned some interesting Czech history along the ride to the apartment.
The apartment is 2 minutes from the main "old town square", which is the heart of the tourist area. It's a very easy walk to everything you'd want to see/or do, although we did elect to take the tram up to the castle rather than walk the steep hill (although it was probably only about a 20-30 minute walk).
Jan's place was very clean, the bed was super comfortable (on the firm side, which is nice), good pillows (important to me), and a nice, big tv set. The bathroom had a full size bathtub (which I like), that you could also shower in. He had a great, working washing machine, with washing soap, extra shampoos, toothpaste, a good blow dryer, towels, etc. All the basics and more. The heat worked really well, which was good because it was unseasonably cold during our stay, so was nice to come home to a warm apartment.
The kitchen was well equipped with all the basics, but we only used the refrigerator (small) for some drinks we bought and the (wonderful) Bosch coffee maker - made such great, quality coffee! We didn't cook, as there are amazing restaurants all around. We especially love to get restaurant recommendations from our hosts, and Jan didn't disappoint. In fact, when you are close to your stay he emails you a wonderful and complete list of restaurants he recommends, listed by proximity to the apartment, with addresses and notes. Super helpful and delicious!
I would highly recommend staying at Jan & Sarah's apartment when in Prague.