We spent only two days, the hotel is wonderful located, rooms confortable and besides we had a problem and needed a doctor, they got one for us without charge. The garage was only half a block away. All positive.
When arriving in Mar del Plata, we selected Delfin on a whim, however were very pleased with the accommodations. Wonderful English speaking staff, and very affordable rates. Delfin is an older hotel, however was very clean and well maintained.