We stayed at Peral56 for four nights. The apartment is clean and comfortable and had everything we needed. The whole building is very well taken off. The apartment is located on a quiet residential street within walking distance from major attractions - 5-7 mins to Alameda Hercules, 15-20 mins to Cathedral. A supermarket and a fresh market are 2-3 blocks away. If you arrive to Seville by car there is a public underground parking 10 mins walk away, that has very reasonable multiple day parking rates (we paid just under 50€ for 5 days) and a very easy access to Ronda Urbana Nte and all major highways in case you plan to make day trips outside of Seville.
Jean Pierre was very prompt and helpful. He waited for us at the apartment, showed us around and provided all the info we might need during our stay.
Overall we had a very pleasant experience!