The location of Peter's appartement is great. 10m to 30m walk near everything you want to see. The appartment was clean, but was missing some things we needed (the kitchen equipment is really minimal). As others have pointed out, the check in could be a lot better. It's a self check-in. You need to pass by a pharmacy 10m from the appartment to take the keys and to bring it back. Also, it is not clear how to enter the building and where the appartment is. The communication could be better, as it seems we don't always speak to the same person (we got told we could leave our bags while the maid was there, then got told we needed to leave them somewhere else). Anyway, if you need a nice place to stay in Madrid it's still a good place, just need to workout a few issues.