We stayed at Palazzo Dasso Guest House and were really impressed with the value for money. The price is very reasonable for what you get, with all the comforts you need in the room, including a coffee machine, toothbrush and toothpaste, and other useful amenities.
The breakfast is excellent and offers a very wide selection, including lactose-free and gluten-free products. The Wi-Fi is fast and reliable, and you can conveniently pay by credit card, including the tourist tax.
The only downsides were the noisy air conditioning and the pillows, which were not particularly comfortable.
Overall, finally a B&B that gets the basics right. Highly recommended!