I spent 5 nights in a studio apartment here. This is a rental apartment complex, with various sizes of apartments and a publicly available sun patio on the roof. There's a central elevator linking all the floors together.
The apartment was very intelligently laid out, with a clear sleeping area and a cooking/eating area and of course a bathroom. Everything was spotlessly clean, and it is clear that the owners/managers have paid a great deal of attention to comfortable details. So although the furniture is from Ikea, it is all very comfortable, and the bed mattress, pillows and linens are great quality. There are multiple cooking devices in the small kitchen, from an Italian coffee machine to an electric kettle and even an electric juicer, and Maria even supplied washing powder for the laundry! The only thing I didn't find (so I bought it and left it in the apartment) was a wine-bottle opener. I'm sure that was just a fluke!
I really appreciated the fact that both Marias were available by text, email or phone for everything--I only took advantage of this for my taxi to the airport when I left, but it was very reassuring. I also really appreciated the time that Maria spent giving me an orientation to the Seville area and to the tourism and food options nearby.
I stayed here for a conference taking place at the Barcelo hotel just over the river--it was an ideal location, just 15 minutes walk or about 7 minutes by bus. It took a bit longer to get down to the tourist areas, but the bus connections are fantastic, and the bus system is very affordable. For practicalities like food, there are two nearby supermarkets and lots of other shopping and restaurants within an easy 3-5 minute walk, and even a market hall nearby.
I would strongly recommend this place to anyone traveling to Seville, especially if they are in the city for a conference at the Barcelo. Its location is ideal, the hosts are friendly and helpful, and it is quite reasonably priced.