My wife and I stayed in Manuel's apartment in mid-February for a couple days/nights. It was amazing!!
First, the host. Manuel is an outstanding host. He gave us many tips regarding best tapas, bars, restaurants, where to enjoy flamenco, and his own passionate "must see" list in Seville. Very gracious and easy communication.
The apartment is wonderful. It is nicely decorated, very clean, with little balconies overlooking the alley below. We enjoyed sangria on the rooftop overlooking the Cathedral a block or two away and watched the sunset.
The location couldn't be better. You are close to everything if you stay here. Easy walking distance to all the top sights and easy strolling across the river to Triana if you wish.
I will definitely stay here again the next time I visit Seville (and I hope that it is soon). We really loved it! And we were both so glad that we chose to stay in Manuel's apartment.