Not the best of experiences to be honest. The big positive is that the location is absolutely superb, overlooking one side of the iconic Sagrada. It's a lively area, and the metro is only a short walk away.
The main issue that we faced was a hot water problem. On the first day that we were there, no problem. On the second, the water was only lukewarm; not knowing the heating system we thought that perhaps it was on a timer, but when we arrived back on day 3 it was stone cold. We reported the issue, but it took well over 24 hours for it to be sorted; basically for about half our stay we had lukewarm or cold showers, which is not really what you would expect for £200+ per night. The annoying thing was that we had a message during the day that it was being fixed saying that the handyman was on to it, but offered no apology, and was topped and tailed by a very generic message about how great Barcelona is (it's better if you don't have to have a cold shower!) and remember to get out by 11am.
Some tips on the apartment:
* there are 2 bedrooms, one double and one single; if you have more than 3 staying they will be on a sofa-bed in the lounge, which as some other reviews mentioned can be a little noisy (you don't notice the noise in the bedrooms)
* the bedrooms can get a bit warm
* the apartment could do with some additional cups etc. For example, there are 5 mugs and 4 wine glasses, and we found ourselves putting on a quarter-full dishwasher because we had run out of mugs and glasses
* we really enjoyed sitting out on the balcony watching the world go by - it's a real feature of the apartment. Only space for 2 people though
Restaurants that we enjoyed:
* Sala 1625, a short walk from the apartment - fairly new, run by some very enthusiastic young guys
* Gaudim, a 5 minute taxi ride away, for a plusher meal
* Cerveceria Catalana, near the main shopping street for some really good tapas