Juan is extremely responsive, friendly, and welcoming. His place was a great choice for an on-the-fly booking in Seville. He had no problem with us showing up the morning before we checked in to leave our bags there. The location is quite convenient for heading into the city (or stumbling back late).
If you are a light sleeper, be aware that this may not be the best place for you. I sleep like a rock and only woke up once, but my girlfriend mentioned hearing things and waking up several times. Additionally, if you are a big person, taller than 185cm or broad, the shower will be tight.
Even though it wasn't strictly perfect (but what is?), Juan's flexibility, responsiveness, and location played its part in making our day and night in Seville a good one.