Firstly Alicia is a lovely, friendly host and very good at communicating regarding the booking and on the check in etc.
The studio itself is in a very quiet street which is good when you need a good night's sleep. One thing to keep in mind though is the apartment/studio itself is very small with very little natural light. This is hard when you are trying to get out and motivated in the morning but if you like dark spaces then that's ok. The studio could be doing with some upgrades on furniture and lights etc. Just to make it more comfortable.
We had a huge problem with the shower because the head itself doesn't stay up so you have to hold it to shower and the tray did not flush properly so as you are showering you are standing in a pool of water. This is only minor but something that should be fixed for the next visitors.
Although Madrid is very warm we found it was quite chilly at night and there was only sheets for the bed. Alicia did say this at the beginning and I'm sure if we had asked her to bring a duvet she would have but maybe its best just to have one there just in case. As we did not want to bother her.
All in all we had a pleasant stay. But for us we need more natural light and a little but more space so just take that into consideration.
The big plus that we were seriously impressed with is Alicia allowed us to check in much earlier and check out really late. This was very generous of her and made our stay more relaxation so thank you.