Ribni ezera hut is a solid two-storey building which can accommodate up to 60 people. On the first floor there is a dining hall, toilets, sinks and a bathroom. The hut staff serves food (soups, meatballs and etc.). You will probably find the conditions in the dormitories to be ok, although they can get a bit crowded if they are full. Camping outside next to the building is also allowed against a small fee.
During the winter season the hut stays open but there is no staff and you will find a wood burning stove only in the dinning hall on the first floor. You may or may not be able to light a fire depending on how skilful you are and how wet are the woods that are left (if there are any at all).
The hut is a good starting point for hikes in the area. The biggest mountain lake in the Rila Mountains, Smradlivoto Ezero, is located nearby. To get there follow the trail with the white-yellow-white marks. This path goes northwest and around the ridge that projects from peak Kyoravitsa in direction of the valley of Rilska Reka. It takes about 45 minutes to reach the lake.
Another option for a daily hike is to follow the path marked with white-red-white signs. It will take you to the top of the ridge south of the hut. In a clear day, going this way will give you plenty of opportunities to enjoy the beautiful views. Once you reach the crest, the red marks will make a right turn. This is the way to Macedonia hut. To go back to your starting point, turn left and look for the white-blue-white marks. The trails climbs peak Kanarata and then goes down before it merges with the path that comes from Mt. Musala (again white-red-white signs). There you need to go left. After a while you will descend back to your starting point.
Ribni Ezera hut is a part of the European long-distance path E-4, which Bulgarian section starts from the capital Sofia and goes through some of the highest mountain ranges in Bulgaria - Vitosha, Verila, Rila Mountains, Pirin Mountains and Slavyanka. I highly recommend this trip to anyone who loves the mountains and have the free time needed (about 12 days).