The location is just wonderful - right in front of the Renfe main railway station and in 2 mins from Picasso Museum, main park and Botanical garden. The central square is in 30 mins of slow walk.
The flat is very clean, recently renovated, well maintained. Internet is good and fast (i work from home, so it is important. i measured and it was ~ 40 Mbps).
It was well worth the price, yet the price (not very high) is justified: the apartment is inside all other renters and Hostel entrance, the walls are paper thin , so folks around get noisy especially all the time coming and leaving (slamming the doors), laughing and talking loud. The apartment is tiny itself, so if you're XL/XL+ size you may simply not fit into shower cabin/kitchen; no windows as it's inside the apartment blocks, so somewhat depressing. Main surprise was that this inner block area is used as a drier for numerous washed clothes (come on folks, it is 21nd century, buy a dryer machine, it's not THAT expensive or space consuming), so outside the flat it's a jungle of bed sheets and t-shirts, cheap detergent odor, increased humidity and endless mosquito-s inside the apartment due to that as a result. Plus a noise of moving ropes and switching linen, - seemed so medieval to me (i'm a traveler from the US).
Overall i enjoyed the stay and would book again if i would like to combine work and city exploring, i did not mind the imperfections above, i guess the price is not crazy high due to that, and apartment was sparklingly clean and very cozy and comfy inside and thought through for a traveler.