We thoroughly enjoyed staying at Lander's place. The location is excellent, first floor views over the harbour towards Hondarribia. Whilst the flat is small, everything we needed was present. Two kids took the bunk beds and the sofa bed was extremely comfortable. There was easy to use WiFi, a TV that was happy to play Spotify or Netflix, a bathroom with plenty of hot water, and a reception desk for the larger building where we could get help with things like the bike storage room. It's a 10 minute walk along the seafront to the centre of the beach village where the main shops are.
Overall, very highly recommended.