Diana's place is just like the listing. A cute room with plenty of storage, a sitting room next to it with a large window overlooking the street. Considering that the apartment is in a busy area in Malasaña, with the window's closed, it's surprisingly quiet.
The location is superb. In five minutes walking, you are in the Gran Via / Callao area. From there, you can get connections by metro or bus to wherever you might want to go.
Diane was a very attentive host while also providing plenty of privacy.