The room does not have a lock and the host accessed the room on at least two occasions when I wasn't there to show other people the room, which left my valuables exposed. The room has air con, or it did, until the host removed the remote while I wasn't there. The room also has a pedestal fan, or it did, until the host shut off the power. The apartment has wifi, or it did, until the host turned it off after he requested to take a copy of my passport and made some personal comments about my Air BnB photograph.
The host is very communicative, if a bit over the top. I was uncomfortable with the level of interaction as he entered the room consistently to inform us of many different things rather than addressing all housekeeping rules in one go. On the positive, the room and shared bathroom are clean and the location is good.
Overall, a lack of security and the request for my personal information made me feel uncomfortable staying here.
EDIT: Since gaining access to wifi again I'm now aware that Spain has recently started requiring registration for travellers. I've been to four Spanish cities in hotels and Air BnB before Sevilla and haven't been asked for this information. Juan's request, along with my credit card details being exposed when the room was being shown to potential tenants all combined to make me feel that my personal security was at risk.