We stayed in an executive suite at the Arts Barcelona. While the suite looks like perfect for travel with kids, I have to note that there is no curtains in the living room part, so not possible to put kids to sleep there, unless they are completely insensitive to light during sleep. We quite enjoyed the hotel, in spite of some service weaknesses. The location is a tiny bit outside the real center (no walking distance, but taxies are cheap), is made up for by pool and beach location.