One of the classiest guesthouses in Ayuthaya, Baifern's rooms are priced by size (sleeping up to four people) and attired with traditional fabrics and antique-effect furniture. There's an inviting lounge, a garden stalked by cats (and, unfortunately, plenty of mosquitoes) and an on-site restaurant serving tasty Thai food (mains around 120B).
A light breakfast is included, and you can add to it from the menu.