The Hotel Branka is lovely. The people running it are extremely nice and kind, and the welcome very genuine. Our room was very clean and comfortable, and as described in the details. There is a nice little bar and a shady terrace. Breakfast was fairly basic.
The harbour in the village is lovely, and just 2 minutes walk away.
Parking in Mundaka is challenging to say the least. The streets are very narrow, and much of the parking is residential. As we left, we saw a larger, slightly out of town parking area just on the road heading on to Gaztelugatxe, which might help you if you are stuck. Its certainly a nice harbour area, and Hotel Branka felt very authentic and was good value for money.