Three of us had a great time staying at the apartment – location is great, it is within walking distance from all of Gaudi sites and an easy 2-3 stops ride (or longer walk) to most of other places, but what is most important for us - is far enough from major tourist crowd, close to number of great local restaurant and cafés that were not crowded with tourists.
There is some water issue – but it’s very manageable as soon as you figure out how it works, it was not an issue for us at all.
It was also great to have a washing machine, especially when you are travelling with kids.