I had a really pleasant stay at Shelleys apartment. The place is small but very clean, brand new and has everything you need. The only thing that is a bit irritating is the way you enter the apartment through a long corridor next to the trash bins. Thankfully there are automatic lights but if you are scared easily then this is something you should be aware of.
However, once you get through the second door you will immediately see the highlight which is the lovely back garden that is very nicely maintained.
The location is great too, right in between Valencia and Dolores Street with lots of nice bars and restaurant around the corner.
I would definitely recommend Shelley's apartment.