We have stayed in a Splendom Suit when our flat was booked out and we needed a place to stay in town. They are a company running serviced apartments (basically a short term let with someone on call 24 hours). They have 2 locations, one in Calle Valencia and one in Plaza Letamendi.
The apartment we stayed in was in the block in Plaza Letamendi which they call the Grandom Suites Barcelona (the other block is called The Splendom Suites).
The flat didn´t have much character, but it was fine for a short stay: clean, with a balcony and everything worked. We arrived quite late, and someone was there quickly to let us in, which was just as well as we had a toddler in tow.
The flats measure between 60 and 75 square metres, are outside-facing with two rooms, bathroom (hair dryer, facilities) and some have an extra loo. You´ll get a living-dining room with double sofa-bed and fully equipped kitchen (fridge, freezer, oven, microwave, household equipment, washing machine, iron and ironing board).
Plus a LCD TV with satellite channels, free wireless Internet connection, power disconnect switch, air-conditioning and central heating in case you are coming in the winter.
There is 1 family apartment specially that caters for families with children with a cot, high chair and baby-changing table. There are also others with an office desk (both subject to availability)
Map of the Grandom Suites