I read in Jerry Hulse's Travel Tips (Sept. 18) a recommendation by Dr. and Mrs. Robert Frost, Grand Terrace, Calif., on Crystal B&B, 2620 S. Fern St., Arlington, Va. 22202, phone (703) 548-7652. On impulse, I called and made a booking. The owners were gracious and well-educated with master's degrees, and my stay was far superior to the hotels I usually stay in. We had a full breakfast daily, transportation to a car-rental firm, and when we left a Georgetown University poster, it was mailed to us gratis. It was immaculate and in an excellent location. Worthy of a repeat.