I stayed in this appartment for only a weekend, but I really enjoyed it.
The 60's feel really worked for me. The place is authentic and feels welcoming. Our host was very friendly and punctual.
The appartment's location is very convenient, close to both bus, metro and tram lines, in a quiet part of the city, but very close to the (touristic) center.

The appartment is everything you need for a stay in Prague. Considering the price it's a steal. I strongly recommend it.