Hi, I have also used the Hostal Moratín and enjoyed it's location and fair price, but I must say frankly that there is a crank on the staff - a fellow who is not a people person. This is not to discourage anyone from taking advantage of an otherwise friendly establishement by any means, I have them on the top of my list for València, but it is worht knowing. As mentioned above, the rest of the staff is friendly and professional. Also know that they did not have air conditioning when I stayed there last in 2000 - but the rate was reasonable enough for me to just buy myself a fan, they were nice about it and didn't bat an eye.
The building still employs a portera, she is a friendly and helpful person who is a font of information.
The issue of the two euro overcharge would certainly have been resolved with the documents, the owner is a stickler for correctness and wouldn't ever play with hidden charges - then again, you may have encountered the crank, lol.