Great location, very close to the Triana bridge, ​Triana and Arenal markets and many excellent restaurants in the Arenal neighbourhood. A very safe and secure building, also very close to a good local supermarket and cinema.
Check in with Marcio was very straightforward and he was very friendly and helpful throughout our stay.
The apartment was as described and perfectly adequate for 2 people staying and working from Seville for one month, with two separate desks in the living room and bedroom. The kitchen is very small, but fine for two people if you are eating out regularly.
However, there were a few disappointing aspects to our stay - we discovered the washing machine did not work on day 2 of 30, and despite a handy man coming to visit , this remained broken throughout our stay. Also on arrival 4 light bulbs were not working, which was a disappointment given the limited natural light in the apartment, these were fixed three days later. Marcio was very quick and responsive to text messages, but you would expect these to be in working order given the cost of the apartment.
During our stay unfortunately an apartment above was being renovated, resulting in extremely loud building noises throughout the day which disrupted working arrangements - not much could be done about this, but it might be something to take into consideration if you're planning on working from here. If you're out during the day this shouldn't be a bother. There are plenty of cheap co-working spaces in the area if needed.