Every night there are two or three small birds coming from the balcony of the house

It's not good if you think it's noisy, and if you don't feel noisy, it's fine.

I rented a house before, there is a hole in the bedroom for air conditioning, but the house is not installed, I sealed it with a scrap bag and tape, and after a while there are birds nesting in it, and in the morning I will hear the sound of birds, and occasionally I can see a vague shadow of a bird through the plastic bag, I feel very good.

That's a good thing. From the perspective of traditional feng shui, the house can attract birds and beasts to come close, indicating that at least its feng shui is not bad; From a natural science point of view, the fact that small birds are willing to come to your balcony shows that the natural environment is quiet, human-friendly, and will not cause danger or disturbance to small animals, and is suitable as a habitat or resting place.

Therefore, I believe that the environment near your home, at least your balcony, is very good, which is a good thing.