Check in was really easy - we called Eugeny and he gave us instructions over the phone to find the key safe. The studio is in a great location - really close to all main sights and next to a lively square. There is air conditioning, so you don't need to keep your windows open and this means you can shut out the noise of the street.
We needed to do some laundry at the studio and were glad to find a washing machine in the apartment. However, there was no detergent - it's pointless buying some during a short stay. Eugeny could provide washing machine detergent and also coffee/tea.
Check out is at midday and there is nowhere to leave the bags after. Eugeny recommended a service found in multiple locations across Seville where you can pay to leave your bag.