You can expect an excellent location, it's a 5min walk to the Placa Catalalunya, and with shortcuts among the alleyways into various sections of the La Ramblas. Within a 10min easy walk to the airport shuttle stop in front of departmental store El Cortes Ingles. On the same street as Asian grocers with fresh greens, cafes and across the road from the Greyhound travel centre (where we just crossed the road to get on tours to Montserrat). The apartment is well appointed and despite being in a central and busy location, is quiet and you can expect plenty of privacy. We had minor issues with fittings e.g. Shower curtain which would not stay up (the rod was propped up and not screwed in), front door handle which was loose on check in and eventually broke away during our week's stay. Laura told us that these fitting upgrades were to be fixed after we left. We enjoyed the use of a well equipped kitchen and a working washing machine. Hot water in the shower was enough for 3 pax ( to be safe, we spaced out showers among us and we had no complaints).
The only thing in the wish list is better quality bed mattresses. Both bedrooms had mattresses which were either too soft or didn't fit the frame - we woke up most mornings with our backs rather sore. This may not be such an evident problem for short stays, but definitely noticeable over our week long stay.
Earlier reviews around communication issues with the host, Laura are quite real. Pre-arrival instructions would have been appreciated, especially when we were coming from another continent and arriving after a 15 hour flight - we received no response to questions for check in directions (e.g. The how, which floor even). Fortunately we were able to get hold of Laura by phone on arrival in front of the building and her cleaning lady was in to let us check in and leave our bags ahead of the check in time. So if you can expect some uncertainty around communication, and trust that Laura will make it right on your arrival, this apartment is recommended for all the reasons above. Pictures are accurate.