The apartment is situated on the Lesser Town Side directly on a main road. Everything including the sights on the Old Town across the river is reachable by foot. Charles Bridge is just a max. 10 minutes walk away so we did not have to use public transport (which - by the way - is directly in front of the building!). There are different supermarkets near the apartment - we recommend Penny Market (ca. 700m by foot). Michael (the host) was really kind and answered our questions very quickly - unfortunately we did not get to meet him but the check-in was trouble-free!
The stay at the apartment was ok - not excellent but also not bad! The equipment lacked a few basics as towels for everyone (there were 3 for 4 people), sugar (instead- there was a lot of salt), and a scissor as well as an oven. Additionally, the shower was really unstable so pay attention when using it!
The room is really modernly decorated and has nice details. The beds were ok - but I would not like to stay there more than for a few days - since the traffic from outside is extremely loud and annoying! There is no AC but 2 fans instead. In summer it can get very hot in the apartment as it is located on the second floor.
All in all, we enjoyed our stay at Prague and the apartment is fine if you are staying for a few nights. Be aware that it is not very large, especially for 4 people.
Thank you for your hospitality Michael!