We had a great stay in Llandudno at Ty Gwyn Bach with our two little ones. Location is really good: just a few minutes walk from the prom on a quiet street and plenty of places to eat nearby as well as a small supermarket. Lounge, diner, bedrooms and bathroom are really nice and fairly spacious. Kitchen is small but has everything you need for a short stay - we even managed to bake some cakes in the oven! Wifi is fast as well which is always handy.
Out and about, there is a soft play (called Bonkers) for kids less than 5 mins walk away which is handy if you're looking to tire out little ones. The war museum is a few feet from the front door too. Had decent food at Harveys grill in Llandudno and would highly recommend a pub we visited in Colwyn Bay - Penybryn - a free house with superb food and ales. All in all an ideal place for a short break if you don't fancy driving around.More