Chontas Lodge is a good place for birders on a budget. My wife and I stayed at Chontas for three nights at the end of December 2015.
Local interest: Chontas offers good birding. We birded along the highway (Troncal Amazonica) and saw lots of Green Jays, Russet-Backed Oropendola, Blackburnian warblers and flycatchers. There are also some local trails, although most of those were inaccessible during our visit due to recent heavy rains. The best operational trail was about a 10-15 minute walk south of Chontas Lodge just after the second bridge on the West side of the highway. Outside of Chontas, you can take a 20 minute taxi ride to the famous (but expensive) Cabanas San Isidro and access their excellent trails and hummingbird feeders for a very reasonable $5 per person (including tea/coffee).
Accommodations: We did not stay at Chontas Lodge proper. Rather, we stayed in the nearby house of Roberto's sister & her husband, who were mostly away on vacation. Our room at the sister's house was small but clean. The bed sheets were changed after the second night, which was unnecessary but appreciated. We also had full use of the kitchen, including a refrigerator, multi-burner gas stove range, pots & pans, and other cooking utensils. (Please note that the nearest town, Cosanga, has very limited grocery options. Most people shop at the larger city of Baeza, which is about a 20 minute drive.) Showering was a challenge. A small electric heater barely raises the water temperature above lukewarm, which is not very warm in a chilly December evening. Also, moths and other flying insects were attracted by the bathroom light; some of these were amazing to look at, but I would have preferred to admire them when I was less naked. Also, it was quite noisy at night and in the very early morning due to a mix of traffic noise (the house is very close to the highway), rooster crowing (the chickens were right outside our back window), and the barking of a cute but hyperactive puppy.
The host: Roberto was very friendly and helpful. He helped us identify birds, patiently described the local trails, and even drew us a map. Unfortunately, we did not get a chance to talk with Roberto very much because he was mostly away due to a family situation. In Roberto's absence, we received a lot of assistance from his family members, including his sister-in-law, an American, who was kind enough to interpret for us and take us grocery shopping in her truck. We did get the sense that Roberto's mother was keeping an eye on us, which made us feel a little uncomfortable. Also, just before we left, she began questioning us about whether we had paid for the room and how much we had paid. Otherwise she was very friendly!
In sum, we had a pleasant stay, despite some inconveniences. Chontas will be even better once Roberto works out some of the kinks.