Clean, and as appears in the pictures. Well located near Mercat Nou and Plaça de Sants subway stations + very close to Mercat de Sants (fish/meat/cheese/fruit&veg/etc.) + Mercadona grocery store.
Address is not GPS/taxi-friendly, so probably best to use Mercat de Sants as pickup/dropoff location if you use taxis.
Kitchen reasonably well equipped, some starter toilet paper / soap provided.
Not super well insulated (probably the norm), so we could hear voices from the street, and even the metro some. Luckily it's a quiet enough area that it didn't disturb our sleep much, but we were concerned that our neighbours might be disturbed by our 3 rambunctious children.
If you have special requests be sure to make them well in advance, our request for a crib came too late to be satisfied. Check-in was smooth and pleasant, but minimal info provided. The wifi router id/password are in small print under the modem itself.