If you're looking to do Vegas on a budget and won't be in your hotel room much, Harrah's is one of the places you need to check out.
The location is fantastic, as it's right in the middle of the Strip. The rooms, while a bit on the smaller side, are clean, and the casino consistently appeals to low-limit players. There are ample $5 table games, and the race and sports book is one of the most underrated on the Strip (unfortunately they took over what used to be one of the most underrated poker rooms on the strip when they expanded it a few years ago!). I'll also recommend the buffet, which is fairly cheap ($20 for lunch, $25 for dinner) and very consistent in quality.
Harrah's isn't a five-star property, but consistency goes a long way with me. I can honestly say I have never had a bad experience here, and that counts for a lot.