I found the Gran Hotel Sardinero by chance when I went to cross Constitucion Bridge. My car broke down, so I had to find a room on the fly and it ended up being very reasonably priced (60 euros for a double, without breakfast). The hotel is a stately mansion dating back to 1890 built right on the city's most famous beach across from the Sardinero and the Grand Casino. Although it has been renovated several times, the inside still retains a decadent, historic air. It has carpeting, large lamps, velvet armchairs in the lobby, big bronze statues flanking the stairs, and a gleaming marble floor in the entrance hall. The rooms, though, have rather outdated furniture. Our room had two beds connected by a wooden headboard. Opposite was a small desk and a table on which the TV sat. The bathroom could use a face-lift. There was no air conditioning or minibar, and you could smoke in any area of the hotel. However, the stay was nice and it was very clean. The reception staff were lovely, and even lent us an umbrella one day.
The Silken Río Santander is located at 153 Avenida Reina Victoria. It's a fairly quiet hotel not too far from the Palacio de la Magdalena, but still a bit far from the city center. You have to catch a bus if you want to go to the Cathedral, for example. The hotel has free wifi throughout and you can get the password at reception when you check in. My double room was clean and spacious.
Hotel Bahia, located between the Cathedral and the bay, is the perfect hotel whether you're travelling for business or pleasure as you're close to everything. The four stars are noticeable in the rooms, which are very large, bright and fully equipped (minibar, large TV, toiletries, hairdryer, table and side table, etc ...). The bathrooms are also large and comfortable. The best part of the rooms are the views, at least for me. Every morning I enjoyed a beautiful sunrise over the bay when I woke up. The only downside is the avenue in front of the hotel, as the traffic can be noisy. The hotel is has good soundproofing, but if you have sensitive ears you'll still hear the cars. The breakfast buffet is really complete, with local produce, pastries, fresh fruit, a variety of omelettes, bacon, and a wide variety of teas and coffees provided by a Nespresso machine. I wasn't paying for the stay when I visited, but if it's within my budget, I'll definitely return next time I'm in Santander!
The service is great. They were very quick when we requested anything. We also have an agreement with the Hotel Real by which you can enjoy spa services. The hotel is very central (ideal for visiting Santander) and the room was spacious and comfortable.
The hotel is 5 minutes from Sardinero beach. The rooms are very spacious and clean. The views are amazing, you see the whole sea and Cabo Mayor lighthouse. The breakfast is amazing, buffet: cold meats, fried eggs, scrambled eggs, sausages, a thousand juices, toast ...
The best of this Silken is its location; a stones throw away from many parts of Santander. It is a very comfy hotel. The area has a variety of restaurants and places to go for tapas and is also very close to the sea. There is free wifi and the buffet is quite varied.