What a find! If you want a posh location with historical attractions within a stone's throw, don't bother. If you're happy to stay in an outstanding apartment with really comfortable facilities in an ordinary residential part of the city when you won't hear another English voice, it's great.
The apartment itself is stylish and comfortable, and ideal for two people. The surprise was the roof terrace, which is (relatively) huge. Great for private sunbathing and wonderful to sit out in the evening with a bottle of beer.
Alex was very helpful in showing us where to go, but under no circumstances, unless you wish to park anything bigger than a skateboard, take your rental car to the underground car park. You go down in a lift and need to be a better driver than me to get into the tiny inaccessible space. We happily parked on the street outside without cost - much better!