We stayed three nights in Ayyuthaiya which was probably one night too many in retrospect. We stayed at Baifern Homestay and paid a little under $10 USD a night for a private room with ensuite bathroom. Baifern homestay was a little out of the way and gave us a bunch of opportunities to walk around the town which is either a good thing or a bad thing depending on how hot it was. When we were there in February, it was quite hot. The owners offer onsite massages and can rent bikes for you.
The room was basic and didn’t have A/C but did have a nice fan. It also didn’t include any breakfast. There were a few nearby stalls where you could eat dinner but I would describe the nearby food options as a bit limited.
If we were to return to Ayyuthaiya, we would probably look for a place closer to the main center where there are more food options and is less out of the way. That said, the price was very competitive in Ayyuthaiya so if you are looking for a really cheap place, this might be the one for you. But for us, we would look elsewhere.