We stayed 3 nights with Miriam on weekends in the end of October.
First of all Miriam was fast to reply and found a way to come from her work to let me check in earlier which was really helpful since I arrived at 11 am. She was in a hurry but she showed me everything in her house and I had no problem using it and helped when we asked something.
The appartment is in an old but well preserved house, with old nice doors and tiny balconies. The flat is not big but very nicely decorated, with individual taste and interesting to stay at. In the bathroom everything worked good even though it is an old house. It was also very clean and ordered. Her cat Nico is so beautiful but he is a bit scared of new people, but if you like cats you might become friends with him and if you don't he won't bother you.
The neigbourhood Lavapies is very cool, lively with lots of stylish bars and cafes, a market which are cheaper than in the very center, very interesting to walk around. Though can be noisy at night on the weekends. It is 15 min walk from Puerta del Sol and Plaza Mayor but there are other attractions nearby like Museum Prado, Reina Sofia Museum, Atocha train station, Retiro park.
Overall it was great experience, and I would recommend to know Miram and stay at her nice place!