We stayed at the Hispano Siete Suiza (not to be confused with the Hotel Suizo) for three nights in September, then moved to a flat in El Born, which was not ready for us right away.
The place is elegant, with a receptionist and porter to greet you on arrival. We got there mid-afternoon, nothing nearby open for lunch, so were escorted to the breakfast room and to the area where snacks are displayed, the charming bartender fixed everything for us. The marble-floored, skylit breakfast room has a couple of Hispano Suiza cars displayed, it is different from anything we've ever seen. The decor throughout is high-style, modern art deco, with sinuous brass railings and frosted glass light fixtures.
The apartments are top quality, they have a balcony, our faced the couryard rather than the view of La Sagrada Familia, next time I'd request that view. The bathrooms are all marble; the kitchen is well equipped, and the counters are granite. Everything is sparkling clean. It was a surprise to have to pay for the iron and board.
The restaurant, La Cupola, overlooks the breakfast area, it looks elegant but we did not eat there. We found a small grocery store around the corner and bought supplies to make breakfast and dinner. There is an EXCELLENT pizza place as you head toward La Sagrada Familia, it has outdoor seating, sorry I can't remember its name.
The buffet breakfast was ample and good. Lots of coffee!
The only fault I personally had was the location really isn't comparable to El Born, which we found to be a much more interesting area for strolling around and absorbing the flavor of Barcelona.