I had a single room on the first floor (one flight up from lobby) on the street side, but I did not have particular noise problems, except one evening (not late) for a short while when there was a conversation in the lobby downstairs and the sound really carries (bounces of the all-wooden flooring).
The key card for the room has a chip. The key card has to be inserted into a slot by the door to activate the lights. That part is common in Europe. But: (1) It has to be inserted with the chip facing away from you. It took me a while to figure this out. And on my second afternoon, I heard the people next door insert the key and try to turn the lights on and off and on and off and on and off. (That shows again how the sound travels between rooms, but it was after all the same wall on the other side that these switches were on.) So I popped open my door, and with them watching, reversed the key card so the chip faced away and then their light worked. (A no-language explanation of how to make it work!) OK, but: (2) There was not a single outlet in the room that wasn't controlled by the key card. THUS: It was impossible to leave anything (laptop, phone, whatever) charging while you were away from the room! Ugh!
The room was small, and to make my bags fit I had to keep my bigger (but still carry-on) bag balanced on top of the safe in the closet! Had I not had a carry-on sized rollerbag, it wouldn't have fit there, and there was no other bag storage provided. (And I had another bag to keep in the tiny area on the other side of the bed.) So if I'd had just slightly bigger (or more) luggage, this very small room would have been a problem. (But I made it work fine in my case.)
I slept fine (I was there for three nights). Each room has different decor / theme, and mine was a purple flower of some sort.
The WiFi internet is by security key and worked very well. I had to get the security key from the person at the desk the first afternoon, and we didn't share a language, but I just said "internet" and he understood what I needed and handed me the slip with the security key. (But I had to keep "sleeping" my laptop every time I left the room, so that it wouldn't discharge, because of the above-mentioned issue with electrical outlets.)
My rate (booked at booking.com) included breakfast. (I seem to recall there was a choice of rates with and without breakfast at booking.com.) The breakfast, however, was pretty minimal (nice juice, but then just a few breads and packaged jam or butter and that's it! It was available from 7:30 am on (I was there during the week, so I don't know if it's different on weekends). Only one packaged sweet bread changed from one day to the next. Although they call it a "buffet", it's not a buffet in the traditional sense (of you walking up and choosing things to carry back to your table). You sit at a table, and then the server (whose also working the checkout desk out front) brings you a basket of breads and spreads, plus pours coffee/juice/whatever. There's a toaster for the sliced bread. (I actually skipped the breakfast the last day because I was running late for the 8:20 train back to Madrid, and didn't miss it at all!) So the breakfast contents were minimal, but the breakfast quality (especially the fresh juice) was still higher than a typical low-cost motel "continental breakfast" in the USA.
The billing was accurate. I ended up being charged the equivalent of just under $55 (including all taxes) per night, which I thought was a good value.
I couldn't figure out how to get the air conditioning (which was high up on the wall but controlled by a remote) to really work. It once whirred for a minute but never again. It seemed to display temperatures which implied that it wouldn't cool below 20 C, but my room was pretty much a constant 21C (with the blinds drawn during the day).
There was a TV but not a large selection of channels (not much for non-Spanish-speakers). I was able to use it as an alarm one day, but it didn't work the next day (which is why I was running late for that train!).
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.