Carla and Jana's place is amazing. It's super close to the station and their directions made it very easy (definately use public transport - so cheap, easy and safe even late at night). Sercurity reception attendents were helpful and welcoming and luggage store was great. The apartment is an easy walk to both all parts of town, we explored all over (saw all main sights and more) on foot. The selection of guides the ladies have at the apartment make it easy to plan days / nights out.
The apartment is stylish (exactly like photos), modern, super safe (again even coming back in the early hours) and exceptionally clean. However the real highlight for us was the fruit, biscuits, nuts and drinks waiting for us on arrival - just what we needed after travelli g. There is also a huge selection of toiletries etc..which is great when you fly with just hand luggage and can't bring much.
I highly recommend this place and Prague in general!