We stayed at Inna and Alex’s in August. The location is ideal for exploring the old town and square - we barely used public transport. If you do want to use train or tram, the apartment is right across from a big station. This is also great for a cheaper airport transfer.
The apartment was large and very clean and had everything described in the advertisement.
Alex and Inna were also great as they responded to air bnb messages during our stay very quickly and also let us leave our bags in the apartment on our last day whilst we explored Prague Castle.
As described, the apartment is reached by 3 flights of stairs so bear this in mind when booking.