HM Dunas Blancas is a very modern, compact style hotel (at least in the bedrooms, common spaces are large and airy) located a 10-15 minute taxi drive from the airport. Taxi cost is €15-25. The hotel is about 2 short blocks from the seafront/beach.
The bedrooms are very clean and modern with clean lines and are very functional. The shower and toilet cubicles are separate, with the sink in the bedroom itself. Beds are European style twins and very comfortable with good quality linens. The shower cubicle does have a full glass door, so you'll need to be comfortable with your roommate being able to see you shower. The shower is super, with both a waterfall head and a removable shower head. The TV is loaded with channels in a variety of languages, including English (full BBC options), German and Spanish. Our room also featured a small balcony, with two plastic string chairs.
If you can get a good rate including the buffet breakfast, go for it - it's one of the best we've ever had, and includes both self serve and fresh cook options. The food is high quality and really plentiful, the dining room spacious and calm, and the staff keep it spotless. The coffee from the machine is not great, but at the excellent rate we paid and the amount of breakfast food we enjoyed, it's certainly not a deal breaker.
The only negatives we experienced were that on arrival, the desk assistant said that our booking was also not in the hotel's system (he said that he could see the booking made on airbnb, but that no one had transferred the reservation into the hotel's system), which was really worrying for us, but was pretty quickly resolved. I know that the hotel was pretty new on airbnb when we booked, so I suppose teething issues are to be expected.
We also learned after arrival that that air con had not yet been turned on in the hotel for the summer period - this was not in the description when we booked, and our room was really uncomfortable at 24.5 degrees for the first 36 hours. After we made a few requests, and I would imagine others complaining too as it was a warm end of April week, the air con was finally turned on. The staff were very gracious about the issue but said that all that they could do was to feed the complaints to the 'director', who I guess eventually listened:) I completely understand that to Mallorcan natives it may not be that warm, but to travellers from other parts of the world it was, and air con should not be advertised as an amenity if it's not available at least on request.
But overall this is a lovely hotel, which we would definitely return to and recommend!