We loved the Maison du lierre. It is idealy located and provided a friendly and comfortable place to stay but don't expect luxury or full service. I would definitely stay again if we go back to Biarritz.
Stayed at the Maison du Lierre for 2 nights with my wife and 2 year old son. Our room was very comfortable and clean. We had a small balcony that overlooked the street and the park that is diagonal to the hotel. The hotel is furnished as if it was a house (it doesn't have that many rooms anyway) which provided a friendly atmosphere. We bathroom was small but usable.
This is not a full service hotel. There is single person that takes care of the reception and the breakfast room. She was very friendly and spoke good Spanish. Unfortunately the reception is only open until early evening. They will make special arrangements if you arrive late but don't expect a wake up call early in the morning or someone to help you with the luggage late at night.
Although the hotel was sold out during our stay we did not have any issues with excessive noise.More