I booked these accommodations with my boyfriend as a birthday present for him, and we both had an amazing time. Howth is absolutely gorgeous, and there's plenty more to do there than I would've expected (and this is someone who's lived in Manhattan her whole life).
Brian was an EXCELLENT host and the studio was incredible both in location and decor. Not only is it located right near the DART (literally a 3 minute walk) that for 3 euros one way brings you into Dublin in under a half hour, but it is embedded in one of the prettiest places I've ever traveled to. Howth is an excellent place to stay whether you want to explore the village itself or go into the city center (in my opinion, it's even worth staying there if you're exclusively interested in traveling into the city). There is plenty of seafood, and you can see seals!
The apartment itself has an ensuite bathroom and mini kitchen, which we found perfect for our stay. It is modern, clean, and as practical as it is beautiful. Moreover, it is right on the water.
We would LOVE to come back to Howth and to stay with Brian again!