I stayed at Sergio's place for a month with my husband and 1.5yo toddler. Overall it was great. The location is awesome, right in the heart of Ruzafa and an easy walk to the old town and the new Parque Central which has lovely places to stroll and sit and a nice playground. The neighborhood is awesome, a very local feel with lots of cool places to explore (endless bars, restaurants, shops). 1min to the grocery store and 5min to Ruzafa Market. The apartment is spacious, though the bedrooms are small. The appliances work well. We had a great month in the apartment.
Now the (few) negatives. The apartment is old but recently renovated, but some things don't work well. Some of the doors don't close, including to one of the bedrooms. The shower floods if you use it for more than 3min. The apartment is on the first floor so most of the windows are frosted so you have to open them to get much natural light. At which point the normal city dust/dirt comes in, but there are no rugs so the floors get dirty really fast and we were constantly sweeping. There's some noise til 11pm from the restaurants below but it wasn't enough to bother us, and could be partly avoided if you use the A/C. There was no laundry detergent, olive oil, dishwasher detergent - things we're fine buying when staying for a month but would be annoying if you were there only a few days. Overall nothing terrible, and Jordi was super responsive on trying to help where he could. Most of these things probably wouldn't bother you if you were staying only a few days.