Absolutely good location. In center of Madrid, walking distance to all attractions...we literally spent only half day visiting almost all spots by WALKING....
The whole building of Charlie y Edu seems a bit run out, but the room is suprisingly cozy and clean.
We only met Edu at the last night of stay, but Charlie is definitely helpful and providing us some very good tips. We had also a very nice chat with Charlie on the first night, very much enjoying the stay with Charlie. Extremely friendly and cool host.