The triples in Balch are massive. My friend had one freshman year, and she ended up loving it. She became quite close with one of the girls, and managed to live with the other girl (there were no issues, they were just not as close/had different friends).
Please feel free to p/m if you have any specific questions! I haven't been on in awhile, and it's been some time since I've been in Balch (2 years now! college goes fast), but I'm here to help!