AMS
Just came from there - a week total including Shabbos with a baby. Portuguese Synagogue highly recommended for shabbos. There is a Chabad with meals but we bought takeout and ate in our room.
Plenty to do, nice city, food etc. Also has potential to do day trips to other cities/overnights (did Haarlem, would have done Haag but best day for us had bad weather there, could have done Antwerp but with our slow travel pace with a baby, only really would have been worth it if we overnighted there.)