It was our pleasure to stay at this apartment, we traveled as a couple, so we had more than enough space. 3 people would fit perfectly as well, for 4 people it might be a bit small.
Clean place, soft beds, good pillows, enough clothing racks and hangers, big bright bathroom, lovely views over some major city sights.
Location is also very convenient, walking distance to many sights around, 5 minutes to the metro, the area is hilly, not the extremes, but mind that.
Very good communication and lots of tips on what to do and where to go.
You are doing great, guys!