Jiri's apartment is an unbelievable catch in the middle of Old Town Prague, and I would highly recommend this to anyone looking for an AirBnB in the area! The apartment itself is huge for being in old-town, and consisted of a very modern kitchen and living room, as well as a huge bedroom, and a large bathroom. All amenities were updated and modern - it looked like the unit had been renovated recently. Jiri even provided useful accessories such as European power adapters, in case travelers forgot/lost theirs'. The location can't be beat -- it's about a 5 minute walk from Charles Bridge, and once you walk downstairs you're in the middle of old town. The ice cream shop "Creme de la Creme" is right around the corner and is excellent - a local favorite apparently.
Check-in/Check-out was extremely smooth. I was able to communicate with Jiri and Marketa via WhatsApp as well as AirBnB. They checked-in with me before, during, and after the stay to make sure everything was okay. They were also very flexible with my check-in and check-out time (even with guests before and after me), which made details such as my delayed incoming flight and luggage storage a breeze.
Overall, I highly recommend this apartment! Not only for an excellent location and apartment, but also the service and flexibility of Jiri and Marketa. Thanks again!