Elenas apartment is right off the Alameda de Hercules where locals gather in the plaza until well into the night. The place is also quite close to other major sites and local hangouts in the Macarena area.
The apartment itself is big enough for two, there is a washing machine which is great for Sevillian travelling as it so hot you will need to increase your frequency of washing. Check in was fast and easy, Elena and Javi live upstairs and were amazing at accomodating a very narrow booking to check in time. They also provided some refreshments upon arrival.
The only thing i will note and this is my own fault for not looking at the specifications of the amenities is a lack of air conditioning which is tough in the peak of summer however there is a fan.