We had a good stay at Javier's place in Sevilla. Location is great - it's about 15-20 minutes walk from Torre de Oro, the Cathedral, Plaza de Espana, and other attractions. Be prepared to do a lot of walking, although everything is close together! Javier was very responsive and waited for us as we arrived about 30 min later than expected. Check-out was a breeze and Javier was kind to allow us to check-out at 11:30. Apartment was comfortable and had most amentities we needed.
Only complaint was that although there was zero street noise, the courtyard style building means that you hear EVERYTHING inside a bit louder than usual - neighbors chatting, music playing. The building was lively all day and into the night until about 1:00 am or so. We also had the unfortunate experience of construction from 8 am - 2 pm, although this will probably be over soon. If you're a heavy sleeper or plan to be out most of the day you won't mind at all, but it may not be for those who want a quiet place to relax in between sightseeing.